MS SQL Server :: Need Solution For SQL Network Interfaces, Error: 25

Error: 25 - Connection String Is Not Valid -- HELP Please!

Jul 25, 2006

I have been having a problem trying to connect to a SQL Server. I have installed the Developer edition on an MS Small Business edition 2003 server
I also installed MS Sql Manager and I was able to create a database and connect to it. The database server is in the same PC. I used the surface configuration to enable remote connections using TCP /IP and pipe lines.
My application runs without a problem on my development machine but when I deployed on this server I get the provider: SQL Network Interfaces, error: 25 - Connection string is not valid Error.
this is my config file setup
<connectionStrings> <add name="Diamond_dbConnectionString" connectionString="Data Source=192.168.1.104MSSQLSERVER;Initial Catalog=Diamond_db;Integrated Security=True" providerName="System.Data.SqlClient" /> </connectionStrings>
I have google and yahoo this error I found a lot of information I've tried many of them but still having the problem. I will appreciate your help solving this problem. I have a customer waiting since last week to see this site and I'm still stuck.
Tia
Charles
PS. Below I pasted the complete error info I get.
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 25 - Connection string is not valid) Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 25 - Connection string is not valid)Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace:

[SqlException (0x80131904): An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 25 - Connection string is not valid)]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +734995
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Connect(Boolean& useFailoverPartner, Boolean& failoverDemandDone, String host, String failoverPartner, String protocol, SqlInternalConnectionTds connHandler, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean aliasLookup) +820
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +628
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +359
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28
System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
System.Data.SqlClient.SqlConnection.Open() +111
System.Data.Common.DbDataAdapter.FillInternal(DataSet dataset, DataTable[] datatables, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +121
System.Data.Common.DbDataAdapter.Fill(DataTable[] dataTables, Int32 startRecord, Int32 maxRecords, IDbCommand command, CommandBehavior behavior) +162
System.Data.Common.DbDataAdapter.Fill(DataTable dataTable) +107
DiamondTableAdapters.COUNTRIES_TEMPLATETableAdapter.GetContriesTemplate() +108

[TargetInvocationException: Exception has been thrown by the target of an invocation.]
System.RuntimeMethodHandle._InvokeMethodFast(Object target, Object[] arguments, SignatureStruct& sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) +0
System.RuntimeMethodHandle.InvokeMethodFast(Object target, Object[] arguments, Signature sig, MethodAttributes methodAttributes, RuntimeTypeHandle typeOwner) +72
System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture, Boolean skipVisibilityChecks) +296
System.Reflection.RuntimeMethodInfo.Invoke(Object obj, BindingFlags invokeAttr, Binder binder, Object[] parameters, CultureInfo culture) +29
System.Web.UI.WebControls.ObjectDataSourceView.InvokeMethod(ObjectDataSourceMethod method, Boolean disposeInstance, Object& instance) +482
System.Web.UI.WebControls.ObjectDataSourceView.ExecuteSelect(DataSourceSelectArguments arguments) +2040
System.Web.UI.WebControls.BaseDataList.GetData() +53
System.Web.UI.WebControls.DataList.CreateControlHierarchy(Boolean useDataSource) +284
System.Web.UI.WebControls.BaseDataList.OnDataBinding(EventArgs e) +56
System.Web.UI.WebControls.BaseDataList.DataBind() +72
System.Web.UI.WebControls.BaseDataList.EnsureDataBound() +55
System.Web.UI.WebControls.BaseDataList.CreateChildControls() +63
System.Web.UI.Control.EnsureChildControls() +87
System.Web.UI.Control.PreRenderRecursiveInternal() +41
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Control.PreRenderRecursiveInternal() +161
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1360

Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42

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Error:25 - Connection String Is Not Valid

Feb 2, 2007

I have installed SQL Server 2005 Developer edition. When I open SQL Server Management Studio, and try to connect to the database engine, I enter these credentials:Server name: LT2000MSSQLSERVERLogin: saPassword: my passwordWhen I try to connect I receive the following error:An error has occured while trying to establish a connection to the server. When connecting to SQL server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections.(provider: sql network interfaces, error:25 - connection string is not valid)(Microsoft SQL Server, Error:87)What can I do?

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SQL Network Interfaces, Error: 26

Jul 26, 2006

I created a web Appplication using Visual Web Developer but when a placed the application in the ftp and I tried to register appeared this message:
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections(provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified). I have made some changes in the web.conf file but I still got the same message, Please can you help with this.
Thanks in advance...!

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Sep 22, 2007

My hosting company 1and1 doesn't allow remote connection, is there a string that I can put into my web.config file to get around that? I have tried changing ports 1433 to 1434 etc but nothing seems to work. Please help.....

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SQL Network Interfaces, Error: 26

May 8, 2008

Developed a website using VS.net 05 which connects to a SQL 2005 server for its data. When I ran the site in VS for testing it works correctly. After I used the copy utility and placed the site files on our web server (seperate from our SQL server) and navigated to the site recieved the error.

Checked and verified that a data connection can be made from the web server to the SQL server
Verified that the HTML connection string was correct in the asp files.
Verified that SQL Server Browser was running (had to start it)
Verified that IIS had NP and TCP/IP enabled.

It would appear that the problem still resides in the application as a data connection could be made from the web server to the SQL server but as this is my first web app launch am wondering if I am missing something else.

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SQL Network Interfaces, Error: 26

Mar 4, 2008

Hi,

I have deployed my ASP .NET 2.0 app (with a SQL Server Express 2005 database located in the App_Data folder) to my production (shared hosting) server. The issue I am having is SQL Network Interfaces error as described at this URL:
How to fix SQL Network Interfaces, error: 26
http://aquesthosting.com/HowTo/Sql2005/SQLError26.aspx

After requesting the above resolution, my hosting company said:
---------------------
The raw data for the database (.mdf file) will not generate the desired results. This database will need to be restored on the SQL server to get the desired and correct results. You will have to upload the backup of the database in order to restore the database on the SQL server.
---------------------

I have never deployed an application with sql server express before, but I was under the impression that I would not have to restore a copy of the database on the server. I have read the post on SQL Server Express and Hosting (http://forums.microsoft.com/MSDN/ShowPost.aspx?PostID=2893587&SiteID=1) and see that it is not recommended in a shared hosting environment, but does this mean it won��t work? This is a really small site where a full-blown sql server db would be overkill.

My question is: is what my hosting company stated true, or are they able to resolve the issue by following the steps found in ��How to fix SQL Network Interfaces, error: 26�? article?

Mike

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Provider: SQL Network Interfaces, Error: 26

Nov 27, 2007

I am creating my first .net site. You can see what I've got so far at www.palmbeachatpickwick.com. It's hosted on GoDaddy and I am using Visual Web Developer and SS2005Express to develop. Trying to get the membership piece working, and I think I am about half way there, but hit a wall. The db connection works insofar as you can join the site and the new user record is successfully added to the db. The confirmation email is successful. The part that's broken which generates the error: 26 message is the page redirect after clicking on "continue". I also get this error when trying to login. Both my login.aspx and join.aspx pages redirect onsubmit to Default.aspx as follows:
After creating an account and clicking continue: ContinueDestinationPageUrl="~/Default.aspx" After logging in: DestinationPageUrl="~/Default.aspx"
There's just a few lines of text on the default page. My master page (used by default.aspx) only has a sitemap data source. No sql data sources specified. So not sure why I am getting a sql error.
FYI, I've posted the code from my web.config and master page file (minus the xml declaration and connection string username and password) here:http://www.palmbeachatpickwick.com/PalmBeach/webconfig.txt
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SQL Network Interfaces, Error: 26 (after Deploying)

Jan 17, 2006

Hello All,
We are migrating from ASP.Net 1.1 to 2.0 and have built a new site with the 2.0 membership controls (Login, etc). We're using VS2005/SQL Server 2005. All works well from the development site but once it is deployed from our local machine to our intranet development server, the following error is encountered after the user types in a valid username/password and clicks the Login button (on the Login control on the Login.aspx page):
Exception Details: System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
Our web.config (for testing purposes only):
<?xml version="1.0"?>

<configuration xmlns="http://schemas.microsoft.com/.NetConfiguration/v2.0">
<appSettings/>
<connectionStrings>
<add name="MyLocalSQLServer" connectionString="Initial Catalog=aspnetdb;data source=localhost;Integrated Security=SSPI;"/>
</connectionStrings>
<system.web>

<compilation debug="true"/>

<authentication mode="Forms">
<forms name="SqlAuthCookie" timeout="10"/>
</authentication>
<authorization>
<deny users="?"/>
</authorization>

<membership defaultProvider="MySqlMembershipProvider" >
<providers>
<clear/>
<add name="MySqlMembershipProvider"
connectionStringName="LocalSQLServer"
applicationName="FormsAuthSql"
type="System.Web.Security.SqlMembershipProvider, System.Web, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b03f5f7f11d50a3a"
enablePasswordReset="true"
requiresQuestionAndAnswer="true"
requiresUniqueEmail="false"
passwordFormat="Clear"
minRequiredNonalphanumericCharacters="0"
minRequiredPasswordLength="3"
/>
</providers>
</membership>

<customErrors mode="Off"/>
</system.web>
</configuration>
Any suggestions will be greatly appreciated!
Troy

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Provider: SQL Network Interfaces, Error: 26

Apr 3, 2008

Hello i am writing a console application . I am using VS 05 professional & Sql server express.

Here is the code with no syntatical errors:

using System;

using System.Data;

using System.Data.SqlClient;

namespace Chapter6

{

class CallSp1

{

static void Main()

{

// create connection

SqlConnection conn = new SqlConnection

(@"server = .centrinosqlexpress; integrated security = true;

database = northwind");

try

{

// open connection

conn.Open();

// create command

SqlCommand cmd = conn.CreateCommand();// specify stored procedure to execute

cmd.CommandType = CommandType.StoredProcedure;

cmd.CommandText = "sp_select_employees_details";

// execute command

SqlDataReader rdr = cmd.ExecuteReader();

// process the result set

while (rdr.Read())

{

Console.WriteLine("{0} {1} {2}",rdr[0].ToString().PadRight(5),rdr[1].ToString(),rdr[2].ToString());

}

rdr.Close();

}

catch (SqlException ex)

{

Console.WriteLine(ex.ToString());

}

finally

{

conn.Close();

}

}

}

}

The error i get in the dos window is:

Error: System.Data.SqlClient.SqlException: An error has occurred while establish
ing a connection to the server. When connecting to SQL Server 2005, this failur
e may be caused by the fact that under the default settings SQL Server does not
allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error L
ocating Server/Instance Specified)
at System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception
, Boolean breakConnection)
at System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObj
ect stateObj)
at System.Data.SqlClient.TdsParser.Connect(Boolean& useFailoverPartner, Boole
an& failoverDemandDone, String host, String failoverPartner, String protocol, Sq
lInternalConnectionTds connHandler, Int64 timerExpire, Boolean encrypt, Boolean
trustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean
aliasLookup)
at System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnecti
on owningObject, SqlConnectionString connectionOptions, String newPassword, Bool
ean redirectedUserInstance)
at System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdent
ity identity, SqlConnectionString connectionOptions, Object providerInfo, String
newPassword, SqlConnection owningObject, Boolean redirectedUserInstance)
at System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOp
tions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection
owningConnection)
at System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConn
ection owningConnection, DbConnectionPool pool, DbConnectionOptions options)
at System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owning
Object)
at System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection o
wningObject)
at System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection ownin
gObject)
at System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection ow
ningConnection)
at System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection ou
terConnection, DbConnectionFactory connectionFactory)
at System.Data.SqlClient.SqlConnection.Open()
at Chapter10.ConnectionSql.Main(String[] args) in D:PROG_DEVVb.NET_devCons
oleAppconnectVerifyAppconnectVerifyAppProgram.cs:line 18
Connection closed.

I have enabled everything in SQL server config manager.

I still get the error!

Can anybody help

Gino

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Dec 14, 2007

I have 2003 server installed on my machine along with MS SQL Server Management Studio and I am able to connect fine to SQL 2000 Instances. On my laptop running Vista Enterprise, I can not connect to these exact same instances via MS SQL Server Management Studio as I am getting the above error. Does anyone else have this problem? I have no idea what to check for anymore. Thanks in advance.

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Jun 20, 2006

ASP v2.0I am getting this error when attempting to sign in to my site once uploaded to the server. Can anyone help me to resolve this error?
Server Error in '/' Application.

An error has occurred while establishing a connection to the server.
When connecting to SQL Server 2005, this failure may be caused by the fact that
under the default settings SQL Server does not allow remote connections.
(provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance
Specified) Description:
An unhandled exception occurred during the execution of the current web
request. Please review the stack trace for more information about the error and
where it originated in the code. Exception Details:
System.Data.SqlClient.SqlException: An error has occurred while establishing
a connection to the server. When connecting to SQL Server 2005, this failure
may be caused by the fact that under the default settings SQL Server does not
allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error
Locating Server/Instance Specified)Source Error:

An unhandled exception was generated during the execution of the
current web request. Information regarding the origin and location of the
exception can be identified using the exception stack trace below.
Stack Trace:

[SqlException (0x80131904): An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)] System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +735091 System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188 System.Data.SqlClient.TdsParser.Connect(Boolean& useFailoverPartner, Boolean& failoverDemandDone, String host, String failoverPartner, String protocol, SqlInternalConnectionTds connHandler, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean aliasLookup) +820 System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +628 System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170 System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +130 System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28 System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424 System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66 System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496 System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82 System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105 System.Data.SqlClient.SqlConnection.Open() +111 System.Web.DataAccess.SqlConnectionHolder.Open(HttpContext context, Boolean revertImpersonate) +84 System.Web.DataAccess.SqlConnectionHelper.GetConnection(String connectionString, Boolean revertImpersonation) +197 System.Web.Security.SqlMembershipProvider.GetPasswordWithFormat(String username, Boolean updateLastLoginActivityDate, Int32& status, String& password, Int32& passwordFormat, String& passwordSalt, Int32& failedPasswordAttemptCount, Int32& failedPasswordAnswerAttemptCount, Boolean& isApproved, DateTime& lastLoginDate, DateTime& lastActivityDate) +1121 System.Web.Security.SqlMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved, String& salt, Int32& passwordFormat) +105 System.Web.Security.SqlMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved) +42 System.Web.Security.SqlMembershipProvider.ValidateUser(String username, String password) +83 System.Web.UI.WebControls.Login.OnAuthenticate(AuthenticateEventArgs e) +160 System.Web.UI.WebControls.Login.AttemptLogin() +105 System.Web.UI.WebControls.Login.OnBubbleEvent(Object source, EventArgs e) +99 System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +35 System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e) +115 System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +163 System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7 System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11 System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33 System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +5102

Version Information: Microsoft .NET Framework Version:2.0.50727.42;
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(provider: SQL Network Interfaces, Error: 26 - Error Locating Server/Instance Specified)

Mar 21, 2008

I have tried to find the solution for the subjectline(provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified) and i got the solution from the below link but when I set my web.config file according to the posted help i couldn't resolve it kindly help me for thatmany thanks,http://www.aquesthosting.com/HowTo/Sql2005/SQLError26.aspx

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Apr 15, 2008

All aspects of my website work as expected when previewed in the browser locally. It appears that I successfully published the website to my hosting company server.After successfully accessing the login page from a hyperlink on the homepage, I attempt to login and receive the following error: Please advise.
Server Error in '/' Application.

An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)Source Error:

An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below. Stack Trace:

[SqlException (0x80131904): An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +800131
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +186
System.Data.SqlClient.TdsParser.Connect(ServerInfo serverInfo, SqlInternalConnectionTds connHandler, Boolean ignoreSniOpenTimeout, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject) +737554
System.Data.SqlClient.SqlInternalConnectionTds.AttemptOneLogin(ServerInfo serverInfo, String newPassword, Boolean ignoreSniOpenTimeout, Int64 timerExpire, SqlConnection owningObject) +114
System.Data.SqlClient.SqlInternalConnectionTds.LoginNoFailover(String host, String newPassword, Boolean redirectedUserInstance, SqlConnection owningObject, SqlConnectionString connectionOptions, Int64 timerStart) +421
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +181
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +173
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +133
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +30
System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +494
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
System.Data.SqlClient.SqlConnection.Open() +111
System.Web.DataAccess.SqlConnectionHolder.Open(HttpContext context, Boolean revertImpersonate) +84
System.Web.DataAccess.SqlConnectionHelper.GetConnection(String connectionString, Boolean revertImpersonation) +197
System.Web.Security.SqlMembershipProvider.GetPasswordWithFormat(String username, Boolean updateLastLoginActivityDate, Int32& status, String& password, Int32& passwordFormat, String& passwordSalt, Int32& failedPasswordAttemptCount, Int32& failedPasswordAnswerAttemptCount, Boolean& isApproved, DateTime& lastLoginDate, DateTime& lastActivityDate) +1121
System.Web.Security.SqlMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved, String& salt, Int32& passwordFormat) +105
System.Web.Security.SqlMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved) +42
System.Web.Security.SqlMembershipProvider.ValidateUser(String username, String password) +83
System.Web.UI.WebControls.Login.OnAuthenticate(AuthenticateEventArgs e) +160
System.Web.UI.WebControls.Login.AttemptLogin() +105
System.Web.UI.WebControls.Login.OnBubbleEvent(Object source, EventArgs e) +99
System.Web.UI.Control.RaiseBubbleEvent(Object source, EventArgs args) +35
System.Web.UI.WebControls.Button.OnCommand(CommandEventArgs e) +115
System.Web.UI.WebControls.Button.RaisePostBackEvent(String eventArgument) +163
System.Web.UI.WebControls.Button.System.Web.UI.IPostBackEventHandler.RaisePostBackEvent(String eventArgument) +7
System.Web.UI.Page.RaisePostBackEvent(IPostBackEventHandler sourceControl, String eventArgument) +11
System.Web.UI.Page.RaisePostBackEvent(NameValueCollection postData) +33
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1746

Version Information: Microsoft .NET Framework Version:2.0.50727.1433; ASP.NET Version:2.0.50727.1433

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Provider: SQL Network Interfaces, Error: 26 - Error Locating Server/Instance Specified)

Apr 30, 2008

Ok can somebody please explain to me why only 1/2 my project is getting this error. I am working with SQLExpress on a remote windows 2003 box. The sql server has its service running and the browser is also running. The server has been set to allow remote connections and to accept TCP/IP and Named Pipes. Now, the website uses asp.net membership and roles to allow the users to login, which actually works. So I know that there are no errors in that connection string. However, all the data acess code is compliled as a sepeate class library thats referenced in the bin directory. When calling those methods to beind to a control in code, is where i run into this error. The class library connection string in the app.config file is exactly the same as the connection string in the web.config...i have checked permissions as well, im at a loss to the reason why this is not working....its probably something simple, but im not finding it.

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Nov 17, 2005

Hi,I am working with Webparts in ASP.NET and getting following error
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
Can anybody knows how to fix this issue. I have SQL Server 2005 Developer edition.RegardsAhmad

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Provider: SQL Network Interfaces, Error: 26 - Error Locating Server/Instance Specified

Mar 24, 2006

I made a simple ASP.NET 2.0 Website that uses memberships, roles, and access to MS SQL Server 2005 database. Everything works fine on my development computer (WinXP Pro). When I deployed this Website on another computer (WinXP Pro) and tried to access the main page from the same computer, I get the error below.
I disabled the Windows Firewall (the only one I use), I ensured that SQL Server Browser is Active and Running, and I changed Remote Connections in SQL Server 2005 Surface Area Configuration to use Local and Remote connections for all the components.
In my Web.Config I used:
<connectionStrings><add name="sqlConnString" connectionString="Data Source=.SQLEXPRESS;AttachDbFilename=|DataDirectory|DBdemo.mdf;Integrated Security=True;User Instance=True" providerName="System.Data.SqlClient"/></connectionStrings>
Any idea why am I getting the following error?

Server Error in '/WebDV' Application.

An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code. Exception Details: System.Data.SqlClient.SqlException: An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)Source Error:

Line 2027: sqlConnection = New SqlConnection(sqlString)
Line 2028:
Line 2029: If sqlConnection.State = Data.ConnectionState.Closed Then sqlConnection.Open()
Line 2030: If Not Page.IsPostBack ThenSource File: C:InetpubwwwrootWebDVDefault.aspx.vb Line: 2029 Stack Trace:

[SqlException (0x80131904): An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)]
System.Data.SqlClient.SqlInternalConnection.OnError(SqlException exception, Boolean breakConnection) +734787
System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(TdsParserStateObject stateObj) +188
System.Data.SqlClient.TdsParser.Connect(Boolean& useFailoverPartner, Boolean& failoverDemandDone, String host, String failoverPartner, String protocol, SqlInternalConnectionTds connHandler, Int64 timerExpire, Boolean encrypt, Boolean trustServerCert, Boolean integratedSecurity, SqlConnection owningObject, Boolean aliasLookup) +820
System.Data.SqlClient.SqlInternalConnectionTds.OpenLoginEnlist(SqlConnection owningObject, SqlConnectionString connectionOptions, String newPassword, Boolean redirectedUserInstance) +628
System.Data.SqlClient.SqlInternalConnectionTds..ctor(DbConnectionPoolIdentity identity, SqlConnectionString connectionOptions, Object providerInfo, String newPassword, SqlConnection owningObject, Boolean redirectedUserInstance) +170
System.Data.SqlClient.SqlConnectionFactory.CreateConnection(DbConnectionOptions options, Object poolGroupProviderInfo, DbConnectionPool pool, DbConnection owningConnection) +130
System.Data.ProviderBase.DbConnectionFactory.CreatePooledConnection(DbConnection owningConnection, DbConnectionPool pool, DbConnectionOptions options) +28
System.Data.ProviderBase.DbConnectionPool.CreateObject(DbConnection owningObject) +424
System.Data.ProviderBase.DbConnectionPool.UserCreateRequest(DbConnection owningObject) +66
System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection owningObject) +496
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection owningConnection) +82
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection outerConnection, DbConnectionFactory connectionFactory) +105
System.Data.SqlClient.SqlConnection.Open() +111
Default1.Page_Load(Object sender, EventArgs e) in C:InetpubwwwrootWebDVDefault.aspx.vb:2029
System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +47
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +1061

Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.42

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Provider: Sql Network Interfaces, Error: 26 -Error Locating Server/Instance Specified

Oct 31, 2007

Hi All:
I'm having problem connecting remotely to my sql 2005 server. I do get this error msg
An error has occurred while establishing a connection to the server. When connecting to SQL Server 2005, this failure may be caused by the fact that under the default settings SQL Server does not allow remote connections. (provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)
I'm using a named Instance and conncting like 192.168.2.1DB120
I have configured to server to accept remote connection.
I can connect locally bout not remotelly

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Provider: SQL Network Interfaces, Error: 26 - Error Locating Server/Instance Specified)

Jul 13, 2007

Hi,

I have been stuck up with this error.

I am using SQL Srver express edition with asp.net 2.0 on windows XP SP2.

When I open the SQL Management studio and execute queries it works fine.

When I exute query in command prompt using SQLCMD -E -S ServernameInstance

It conect with database and I can freely execute queries in command prompt.

I have also tried to connect with Classical ASP 3.0 It also works fine. No error

I have made all changes that u specified in ur article.

But When I try to connect with asp.net. It gives me error.

"provider: SQL Network Interfaces, error: 26 - Error Locating Server/Instance Specified)"

Same files are workign fine in my office with SQL Server 2005 enterprise edition and ASp.net 2.0. on Windows server 2003. I do not get this error. But at home I am facing this problem again and again.

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When Asynchronous Processing=true, I Get Provider: SQL Network Interfaces, Error: 26 - Error Locating Server/Instance Specified

Sep 26, 2007

This problem happens on this particular machine and doesn't happen on other machines that I have. And I think this problem belongs to this forum. Because the problem is triggered by a special setting in the connection string.
I followed the steps of threads including Xinwei Hong's instruction for fixing this error(26) but has no luck.

The problem occurs when I call SqlConnection.Open().

I am using window xp, sql2000. the named instance is on local machine, my connection string is like

"Data Source=MSL-1417762\SQL2000;Initial Catalog=PopulateForeignKeys_MSL_1417762_2_5984;Integrated Security=True;Pooling=False;Asynchronous Processing=true"

Whenever I change Asynchronous Processing=true into Asynchronous Processing=false, the problem is gone.

This problem also occurs when I use Visual Studio - Server Explorer - Add Connection dialog - Advanced button - Advanced Properties window where you can set Asynchronous Processing property to true.

Can you please help?

Thanks,

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SQL Network Interfaces, Error: 26 - Error Locating Server/Instance Specified

Jun 12, 2006

I'm having an issue when moving my site from my laptop that's running VWD Express and SQL 2005 Express to my production Windows 2003 server running SQL 2005 Standard. The site is a portal site that authenticates to my Active Directory, and uses roles bases in SQL. I can open the site on the laptop and everything works fine and I have no problems. Once I copy the site to the production server and try to access the site, I get the login page fine and try to login. The default page never opens so I'm thinking this must be some type of roles issue. Do I need to do anything with my ASPNETDB.MDF file to make it work with SQL 2005 Standard instead of Express version? I've already made sure that the SQL server is accepting remote connections...what other things do I need to do to my SQL server to ensure proper functioning? Any particular security user I need to be running particular services under? Thanks in advance...
MikeD

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SQL Network Interfaces, Error: 26 - Error Locating Server/Instance Specified

Jan 30, 2008

Hi, I have installed SQL Server 2005 and Visual Studio 2005 in my machine.
I got an error when I tried an example.

"An error has occurred while establishing a connection to the server.
When connecting to SQL Server 2005, this failure may be caused by the
fact that under the default settings SQL Server does not allow remote
connections. (provider: SQL Network Interfaces, error: 26 - Error
Locating Server/Instance Specified)" .

I followed many advice online and did the following but still wrong.

Enable networking protocols during managment configuation.

add port 1343 on firewall or turn off the firewall.

make changes in web.confige as

Code Snippet
<?xml version="1.0"?>

<configuration>
<appSettings/>
<connectionStrings>
<remove name="LocalSqlServer"/>
<add name="LocalSqlServer" connectionString="Data Source=localhostand;Initial Catalog=Players;User ID=test;Password=test"/>
<add name="SqlConnectionString" connectionString="Data Source=localhostand;Initial Catalog=Players;User ID=test;Password=test"/>
<add name="OdbcConnectionString" connectionString="Driver={MySQL ODBC 3.51 Driver}; server=localhost;database=players;uid=test;pwd=test" />
<add name="OleDbConnectionString" connectionString="Provider=Microsoft.Jet.OLEDB.4.0; Data Source=C:andplayers.mdb" />
</connectionStrings>
<system.web>

<compilation debug="true"/>

<authentication mode="Windows"/>

</system.web>
</configuration>

Thanks for your help.

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Jun 12, 2007

I am trying to use the visual studio for database professionals. I get the error 26 when I try to import a schema from an existing database. I am using a database from my local instance. I test the connection and the test succeeds. What is causing the error 26?

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I have SQL 2005 standard edition (64) installed on Win 2003 (x64) as the database server. (dbserver machine)

Despite setting up:

Remote option under surface configurator,

TCP settings under configuration wizard,

No firewall,

I am still getting the same message when I try to connect from the application server using the SQL manager. I can connect to the server on the dbserver machine but not remotely.

I have read through the threads in the forum and applied most recommendations without avail. Please help.

Thanks

Haluk Tezcan

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Apr 12, 2007

I've build a website with asp.net and on my local machine it run very we. but when I store my website on a server, I have a error : ...error: 25 - Connection String not valid...
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So, what can I do to solve this probleme.
Thanks !

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Hi Champs,

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Problem Description : We are developing windows applicaiton in which we call webservice which was deployed on the same server where SSIS packages are deployed.
Now from Code we are passing FilePath name in variable and execute the Package. But the SSis result says that
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More Information:

1. Full Permission are given on this network folder.
2. Package executes successfully from SSIS development solution (BIS solution)
3. Deployed packed executes successfully from the Database Server.
4. From Development pc packege executes successfully.
5. Other packages deployed on the same server executed suucessfully with same configuration and scenario.

Only this package is not executing.

-- the only differece with this package with other is -

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Can any one suggest the appropirate solution for this problem...

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I am converting over from MSDE to SQL Express. My front end program is unable to connect to the database. To troubleshoot, from the remote computer I tried connecting with the management program and I get the Error 26 unable to connect.

Here is what I have done: I made sure that the SQL Server configuration has been changed to allow network connections (both TCP and named pipes). I have disable windows firewall on both machines. I confirmed that I can connect from the remote machined to the server by network browsing. Both machines are running XP Proff. There is no other security software running on either machine.

More Info. when attempting to log on I am using the server authntication, I use "sa" as the user id plus my password.

Goal. The front end of database program connects to the server remotely using a program called Hamachi over the internet. This works without a problem on MSDE. But for now I am simply try to connect using the managment program which lets you browse for other serves. When I do this it shows the remote computer, but not the name of the computer but not the SQL server which I type in like the following: "INTELsql1"

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One the classic ASP
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Microsoft OLE DB Provider for ODBC
Drivers (0x80004005)
[Microsoft][ODBC SQL Server
Driver][DBNETLIB]General network error. Check your network
documentation

or

Microsoft OLE DB Provider for
ODBC Drivers (0x80004005)
[Microsoft][ODBC SQL Server
Driver]Timeout expired
on the
ADODB.Connection.Open
On the .NET2 apps we
log
Message Timeout expired. The timeout
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responding.

StackTrace at

System.Data.ProviderBase.DbConnectionPool.GetConnection(DbConnection
owningObject)
at
System.Data.ProviderBase.DbConnectionFactory.GetConnection(DbConnection
owningConnection)
at
System.Data.ProviderBase.DbConnectionClosed.OpenConnection(DbConnection
outerConnection, DbConnectionFactory connectionFactory)
at
System.Data.SqlClient.SqlConnection.Open()
at
System.Web.SessionState.SqlSessionStateStore.SqlStateConnection..ctor(SqlPartitionInfo
sqlPartitionInfo)

Source .Net SqlClient Data Provider

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Nov 5, 2006

Hy everyone,

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When I connect to the Sql Server 2000 through LAN, no problem. But when I connect through GPRS - VPN, the error occurs. But, the PDA- phone connection is via Bluetooth and at ping no TimeOut appears, the replies are about 600-700 ms. When connecting with a desktop computer through GPRS no such problem occurs.

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A specialist from the GPRS provider told me to use 3G phone , but , because the GPRS phones have already been bought, this would be a too big investment. So, I don't think this is a good idea in this moment .

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