Error 26 When Connecting To SQL Server Instance

Mar 8, 2008

I do hope someone can help

I have a windows server with SQL Express, I have followed the link here and still no luck

http://blogs.msdn.com/sql_protocols/archive/2007/05/13/sql-network-interfaces-error-26-error-locating-server-instance-specified.aspx

I have checked and checked again a thousand times

I can remote desktop and connect through SQL Management Express, but when I try this on my local machine I get the error 26

My knowledge is very limited and could do with some expert help


PS EDIT
I read somewhere that in TCP/IP properties all IP's should be set to 1433, is this correct
at the moment, apart from ALL IP which is set to 1433, IP1-9 are set to Dynamic Port =0, should I be setting all these to 1433

??

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Error 26 Connecting To Remote SQL Server Instance

Jan 17, 2008

I am attempting something that I have done many times before; however, in this instance it continues to fail.


I am trying to connect Management Studio to an instance of SQL Server 2005 Express over a VPN. The Management Studio connect dialog always fails with Error 26.


I have:

Enabled the instance for remote connections €“ both TCP/IP and Named Pipes

Ensured that the instance is enabled for TCP/IP on the VPN address (10.2.1.1) and on port 1433

Ensured that the instance is running

Ensured that SQL Browser is running

Ensured that ports 1433 (TCP) and 1434 (UDP) are open on the firewall for inbound traffic

Rebooted the server following this configuration to ensure that the instance services are refreshed

Tried to connect from three separate clients (albeit on the same remote network)

Disabled the firewall to ensure no further complications (as a last resort)

I have this exact same setup functioning on a separate server.


There is an additional backstory to this problem; however, I will not complicate the scenario with it now. If you feel you can help then I can elaborate further on the server€™s history.


Thanks


James

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We have installed SQL 2000 SP4 on Windows 2000 Server. We created named instances on the SQL server.
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This has worked fine for weeks, and months.

I'm running Vista Ultimate. SQL 2005 is set as my Default instance, and SQL2000 is set as (local)SQL2000.

Today, actually half way through today, I restarted my computer after installing Photoshop Updates.

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--Edit

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Hi All...



I am trying to move my site (incomplete) for testing and I am finding that the Db connection process to be

the most difficult, well back to my problem. I can't seem to get past this error and am frustrated with overall

connectivity problems. Please help!!!



===================================================================================


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) +735123
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
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System.Web.Security.SqlMembershipProvider.CheckPassword(String username, String password, Boolean updateLastLoginActivityDate, Boolean failIfNotApproved) +42
System.Web.Security.SqlMembershipProvider.ValidateUser(String username, String password) +83
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Version Information: Microsoft .NET Framework Version:2.0.50727.42; ASP.NET Version:2.0.50727.210





Now you all must admit that, if your somewhat new to this databasing, It's a ***.



The source for my application is Visual Web Designer 2005 Express

It is an ASP.Net driven site with membership roles and all the good stuff.

the latest theory is that I need to change the provider config in the web.config file from AspNetSqlProvider

to something else. Most of my complications and frustrations come from GoDaddy and no access to the

shared server (understandibly).



I hope I gave enough info for help and not too much..



Dave



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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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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
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System.Data.SqlClient.SqlException: An error has occurred while establishing
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An unhandled exception was generated during the execution of the
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[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

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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)
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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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Error: 26 Error Locating The Server/instance Specified (.NET SQLClient Data Provider)

Jun 8, 2007

All,



One of our developers decided to load 2K5 client tools on to their laptop. They cannot connect getting the following error:



....Error: 26 Error Locating the Server/instance specified (.NET SQLClient Data Provider)....



1.) Allowing remote connections IS enabled.

2.) SQL Browser Service is ON

3.) Windows Firewall is NOT running

4.) All protocols (except VIA) are enabled



Others at this office, including myself, can connect fine in Management Studio. Only this one developer cannot.



Any thoughts and/or help would be much appreciated. I think that the problem has something to do with the first sentance above but I am not positive.



Thanks in advance,

DBA Ben

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Connecting To A Names Instance Through A Firewall.

Mar 12, 2007

Hi

I am really struggling with this problem.

I am connecting to several SQL 2000 servers on another LAN from my workstation and I have to go through a firewall.

I got the firewall people to open port 1433 and was then able to connect any server with a default instance using Query Anlyzer and the IP address of the Server.

When I try to connect from my workstation to a server with a named instance I am being blocked by the firewall before it gets to the server.

I went into Client Network Utility on my workstation and removed named pipes which only left Tcpip using port 1433.

Fire wall is now blocking “nbname UDP 137”.

Is there a setting somewhere on my workstation that I can force the traffic to the named instance to use Tcpip through port 1433.

Any Help would be great.

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Connecting To Default Instance For The First Time

Mar 16, 2008

I just installed Sql Server 2005, and opened the Sql Server management studio, and the connect to server dialog box popped up, i selected database engine, but what do I put in the server name box? I tried my computer name, and got an error, i tried localhost and got an error, i tried my computer name/localhost and got an error. I installed it as the default instance with windows authentication, and I verified that the sql server service is running, but I always get a login error. Can anyone help me get started?

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Connecting To A Remote SQL Express Instance

Feb 11, 2008



Can anyone tell me what are the necessary steps if I want to connect to a Remote SqlExpress Instance ? I am using Visual Studio 2005. When I tried to connect it says that the remote server does not allow remote connection. I have enabled all the protocols from Sql Server Configuration manager and disable the firewall. But it still not working. Pls Help me.
Thank You.

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Odd Issue Connecting To A Named Instance.

Aug 16, 2006

Hi everyone,



Please forgive me for the newbie question, I've done almost all of my DBA work on Oracle(on UNIX so I'm learning alot of AD stuff too) and am new to MS SQL Server.

I've got a SQL 2005 standard server that I'm trying to get to act as a publisher for a SQL 2005 Express instance, and I think I've narrowed down my problem to a connection issue.

(FYI, the Publisher works fine with another 2005 Standard server)

When I try to connect from the standard server to the express server using 'XYZSQLEXRESS' as my server name, it fails stating that it couldn't find the service, but I can connect just fine if I use 'XYZ' as the server name.

I think this is why I'm having trouble getting replication going as the replication wizard tells me that I have to connect via 'XYZSQLEXPRESS' in order to run the replication scripts.

Can anyone point me to the correct documentation to resolve this problem? Everything was easy-mode DBA work until we tried to add SQL Express to the mix, and I'm sort of running out of time on this one.



Thanks for any help!





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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"?>
<!--
Note: As an alternative to hand editing this file you can use the
web admin tool to configure settings for your application. Use
the Website->Asp.Net Configuration option in Visual Studio.
A full list of settings and comments can be found in
machine.config.comments usually located in
WindowsMicrosoft.NetFrameworkv2.xConfig
-->
<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>
<!--
Set compilation debug="true" to insert debugging
symbols into the compiled page. Because this
affects performance, set this value to true only
during development.
-->
<compilation debug="true"/>
<!--
The <authentication> section enables configuration
of the security authentication mode used by
ASP.NET to identify an incoming user.
-->
<authentication mode="Windows"/>
<!--
The <customErrors> section enables configuration
of what to do if/when an unhandled error occurs
during the execution of a request. Specifically,
it enables developers to configure html error pages
to be displayed in place of a error stack trace.
<customErrors mode="RemoteOnly" defaultRedirect="GenericErrorPage.htm">
<error statusCode="403" redirect="NoAccess.htm" />
<error statusCode="404" redirect="FileNotFound.htm" />
</customErrors>
-->
</system.web>
</configuration>




Thanks for your help.

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