The Prelogin Packet Used To Open The Connection Is Structurally Invalid
Dec 17, 2007
On one of the workstations being used by a developer we see the following entries in the event log:
Event Type: Error
Event Source: MSSQLSERVER
Event Category: (4)
Event ID: 17828
Date: 17/12/2007
Time: 10:24:25
User: N/A
Computer: <removed>
Description:
The prelogin packet used to open the connection is structurally invalid; the connection has been closed. Please contact the vendor of the client library. [CLIENT: <local machine>]
For more information, see Help and Support Center at http://go.microsoft.com/fwlink/events.asp.
Data:
<removed>
Searching on the internet we don't get a satisfying answer. This connection to the database is made through a .NET web service using the default client libraries from the Base Class Library. We are talking about a fully patched SQL Server 2005 Developer Edition and .NET Framework 3.5.
Any clues?
I only found the following "relevant" link:
http://www.webservertalk.com/message1539518.html
But I am the kind of guy that likes to know what went or goes wrong instead of trying out hacks like the one described in the above link.
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Jun 11, 2007
Hello,
While doing performance testing on a Tomcat based web application using the v1.1 JDBC driver connecting to SQL Server 2005, the tomcat server has been throwing the above exception at a fairly low rate. I have seen some related issues in the forums with v1.1 of the MS JDBC driver, but those were asking about connection reset related errors. In this case the 'invalid packet header' exception is consistently seen. I am in the process of repeating the test with some additional application side logging turned on, and have tried enabling FINEST level logging for the driver, but that leaves me with a 500MB log file and so far no instances of that exception in question being thrown. This is not unusual, the error has only been seen about 14 times in about 20 tests, with each test running about an hour and a half.
A few quick tests with the 1.2 driver did not throw this exception, but did throw a high number of '[Connection|Statement|Resultset] Closed'
While I gather more information, I was wondering if there is anything significant in this particular exception type that could point to a more specific set of tests I could run?
The exceptions seen so far:
Exception #1:
java.lang.NullPointerException
at com.microsoft.sqlserver.jdbc.DBComms.receive(Unknown Source)
at com.microsoft.sqlserver.jdbc.DBComms.receive(Unknown Source)
at
com.microsoft.sqlserver.jdbc.SQLServerStatement.doCloseServerCursor(Unknown
Source)
at
com.microsoft.sqlserver.jdbc.SQLServerStatement$CloseServerCursorRequest.execute(Unknown
Source)
at
com.microsoft.sqlserver.jdbc.SQLServerConnection.executeRequest(Unknown Source)
at
com.microsoft.sqlserver.jdbc.SQLServerStatement.closeServerCursor(Unknown
Source)
at com.microsoft.sqlserver.jdbc.SQLServerResultSet.close(Unknown
Source)
at com.X.db.CSInternalDB.close(CSInternalDB.java:950)
at com.X.db.CSQuery.close(CSQuery.java:169)
at
com.X.container.ContainerManager.getFolderContent(ContainerManager.java:1313)
at
com.X.container.ContainerCommands.getContent(ContainerCommands.java:1086)
at
com.X.container.ContainerCommands.execCommand(ContainerCommands.java:192)
at
com.X.BaseHandler.getObjectFromDoc(BaseHandler.java:169)
at com.X.BaseHandler.processDOM(BaseHandler.java:284)
at com.X.Dispatcher.execIt(Dispatcher.java:546)
at com.X.Dispatcher.execCommand(Dispatcher.java:333)
at
com.X.BaseHandler.getObjectFromDoc(BaseHandler.java:169)
at com.X.X.execute(X.java:600)
at com.X.HttpReceiver.doRequest(HttpReceiver.java:275)
at com.X.HttpReceiver.doGet(HttpReceiver.java:181)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.cluster.tcp.ReplicationValve.invoke(ReplicationValve.java:346)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)
#2:
java.sql.SQLException: The DBComms.receive operation resulted in an invalid
packet header type:-86. PktNum:0. nReceived:8.
at
com.X.db.CSPreparedStatement.executeQuery(CSPreparedStatement.java:474)
at com.X.db.CSAnalyzer.executeQuery(CSAnalyzer.java:485)
at com.X.db.CSQuery.sqlPrepareExecute(CSQuery.java:559)
at
com.X.form.FormManager.getInternalFormProps(FormManager.java:1803)
at
com.X.form.FormManager.getInternalFormProps(FormManager.java:1762)
at
com.X.route.RoutingCommands.genericPrepareRoutingPage(RoutingCommands.java:5618)
at
com.X.route.RoutingCommands.prepareRoutingPage(RoutingCommands.java:3899)
at sun.reflect.GeneratedMethodAccessor75.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at
com.X.iplugin.DynamicCommandMethod.execute(DynamicCommandMethod.java:35)
at
com.X.route.RoutingCommands.execCommand(RoutingCommands.java:209)
at
com.X.BaseHandler.getObjectFromDoc(BaseHandler.java:169)
at com.X.BaseHandler.processDOM(BaseHandler.java:284)
at com.X.Dispatcher.execIt(Dispatcher.java:546)
at com.X.Dispatcher.execCommand(Dispatcher.java:333)
at
com.X.BaseHandler.getObjectFromDoc(BaseHandler.java:169)
at com.X.X.execute(X.java:600)
at com.X.HttpReceiver.doRequest(HttpReceiver.java:275)
at com.X.HttpReceiver.doGet(HttpReceiver.java:181)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:689)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:802)
at
org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at
org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at
org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at
org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at
org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at
org.apache.catalina.cluster.tcp.ReplicationValve.invoke(ReplicationValve.java:346)
at
org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at
org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at
org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at
org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:869)
at
org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:664)
at
org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at
org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:80)
at
org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:684)
at java.lang.Thread.run(Unknown Source)
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Msg 10054, Level 16, State 1, Line 0
TCP Provider: An existing connection was forcibly closed by the remote host.
OLE DB provider "SQLNCLI11" for linked server "" returned message "Client unable to establish connection".
Msg 26, Level 16, State 1, Line 0
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Jan 12, 2004
Hi there,
I have a software package that uses SQL server for the database. When loading a large amount of data I receive this error message. Can you please give me some idea what may be causing this error.
********* Memory Status *********
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Total of physical memory(KB) = 2147000
User Total of virtual address space(KB) = 2147352
Free virtual user(KB) = 2110500
Percent of Free physical = 0.241979
Percent of Free Virtual space = 0.982838
FIRecordset::GetNewConnection : DBException (Could not open FCB for invalid file ID 3 in database 'finance'.
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May 28, 2007
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I do not even have any idea where to start to debug this. The ExecuteNonQuery() runs a delete SQL query. It works 99.9% of the time. I do not see anything wrong when this error happens.
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Dear All,
i'm getting this error while trying to connect to any of the servers.
on that perticular system, sqlserver2000, 2005 client tools are there.
the error is :
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thank you very much
Vinod
Even you learn 1%, Learn it with 100% confidence.
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Jan 25, 2008
Hi,
Anyone know what I'm doing wrong? My JDBC is erroring. I'm using the Microsoft 1.2 driver, I have a SQL Server 2005 back end with the following clients connecting to it:
ASP.NET 2.0 web application
Visual Studio C# console applications (*2)
Java command line client.
Everything runs hunky-dory on my dev. environment (laptop, local, launched via Visual Studio) but now it's on the server, the Java client is erroring.
When I use the 1.2 sqljdbc.jar file, I get:
25-Jan-2008 12:20:29 com.microsoft.sqlserver.jdbc.SQLServerConnection Prelogin
WARNING: ConnectionID:1 TransactionID:0x0000000000000000 Prelogin response packet not marked as a REPLY
My Error Trap:
--------------
SQL STATE : 08S01
ERROR CODE: 0
MESSAGE : The TDS protocol stream is not valid.
When I use the 1.1 file I get:
My Error Trap:
--------------
SQL STATE : 08S01
ERROR CODE: 0
MESSAGE : The TDS prelogin response is incomplete. The target server must be SQL Server 2000 or later.
I don't know what these errors mean. I've tried compiling as java 1.5 and 1.6 with the same results. It works fine on my laptop (Vista Home Premium) but won't when I try and connect to the server. I've searched the web on the error messages and can't find an answer yet.
Any help appreciated.
My drivers are the Windows versions. Also, everything else is working okay on the server: The consoles are up and running and the web browser connects and SELECTs, UPDATEs & INSERTs okay.
I ought to mention: My laptop is running SQL Server Development edition and the Server is running obviously something else.
My SQL Server version is 9.0.1399 and the OS is Windows Server 2003. SQL Authentication is mixed mode.
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Jun 19, 2008
When trying to connect to a remote SQL 2005 Express Server, I get this error message: [DBNETLIB][ConnectionOpen (ParseConnectParams()).]Invalid connection.
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Mar 30, 2005
Hey everyone, hope you all can help me with this problem.
We have a remotely hosted website, but we have a SQL server in our company (powers our instore portal). I have set up our router so that i can connect to remote desktop and sql server. I can connect to the remote desktop and i can connect to the sql server with query analyzer. On our local site i can set up a connection to look at sqlserver.underpargolfutah.org and it works fine, everything goes well.
Now here is the problem. On the hosted site i have set up the following
web.config >
<appSettings>
<add key="sql_dsn" value="server=************.underpargolfutah.org;database=online;uid=sa;pwd=*******" />
</appSettings>
default.aspx >
Public Class shopDB 'publicly declare typical stuff for connections Public conn As SqlConnection Public cmd As SqlCommand Public reader As SqlDataReader Public dsn As String = ConfigurationSettings.AppSettings("sql_dsn").ToString Public Function getBaseSelectionsByType(ByVal type) 'declare the connection conn = New SqlConnection(dsn) 'declare command cmd = New SqlCommand("SELECT * FROM category", conn) 'open the connection conn.Open() 'grab data reader = cmd.ExecuteReader(CommandBehavior.CloseConnection) Return reader End Function
End Class
This should all work but i get the following error
[SqlException: Invalid connection.] System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction) +474 System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction) +372 System.Data.SqlClient.SqlConnection.Open() +384 v3.shopDB.shopDB.getBaseSelectionsByType(Object type) in shopDB.vb:21 v3.shop_default.Page_Load(Object sender, EventArgs e) in default.aspx.vb:32 System.Web.UI.Control.OnLoad(EventArgs e) +67 System.Web.UI.Control.LoadRecursive() +35 System.Web.UI.Page.ProcessRequestMain() +742Any ideas? i am stumped.
Thanks in advance-Darren
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Mar 23, 2007
Hi folks.
I'm a programmer, and very new to databases... but I've worked with 7 or 8 of them so far and I've had no problems. I just had a client get himself a server. He got it from his friend and that friend set it up and sent me the info. It has .NET 2.0 and 1.1 and it has MSSQL Server 2005 Express. He sent me the login info for the database and I connected fine via my enterprise manager... but, when I try to connection asp.net I get "invalid connection" I'm using the exact same info. I've tried setting the server as (local) and as the web address I used in my enterprise manager. I recieved the same error for both.
Any suggestions welcome, thanks!
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Jan 3, 2008
Hi,
I have installed window vista on my computer. And configure a .net applaction. But When I want to browse the application there a error
Server Error in '/nutri-cafe' Application.
--------------------------------------------------------------------------------
Invalid connection.
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: Invalid connection.
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: Invalid connection.]
System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction) +474
System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction) +372
System.Data.SqlClient.SqlConnection.Open() +384
System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState) +44
System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +304
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +77
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) +36
NutriCafe.Database.States() +305
NutriCafe.ChooseSchool.Page_Load(Object sender, EventArgs e) +927
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750
--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:1.1.4322.2032; ASP.NET Version:1.1.4322.2032
Please help me.
Navi
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Jan 3, 2008
Hi,
I have installed window vista on my computer. And configure a .net applaction. But When I want to browse the application there a error
Server Error in '/nutri-cafe' Application.
--------------------------------------------------------------------------------
Invalid connection.
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: Invalid connection.
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: Invalid connection.]
System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction) +474
System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction) +372
System.Data.SqlClient.SqlConnection.Open() +384
System.Data.Common.DbDataAdapter.QuietOpen(IDbConnection connection, ConnectionState& originalState) +44
System.Data.Common.DbDataAdapter.FillFromCommand(Object data, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +304
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, Int32 startRecord, Int32 maxRecords, String srcTable, IDbCommand command, CommandBehavior behavior) +77
System.Data.Common.DbDataAdapter.Fill(DataSet dataSet, String srcTable) +36
NutriCafe.Database.States() +305
NutriCafe.ChooseSchool.Page_Load(Object sender, EventArgs e) +927
System.Web.UI.Control.OnLoad(EventArgs e) +67
System.Web.UI.Control.LoadRecursive() +35
System.Web.UI.Page.ProcessRequestMain() +750
--------------------------------------------------------------------------------
Version Information: Microsoft .NET Framework Version:1.1.4322.2032; ASP.NET Version:1.1.4322.2032
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Oct 13, 2004
hi all,
i got following error when i try to connect my asp.net page that is uploaded on ftp server,
then...
'Invalid connection'
'System.Data.SqlClient.SqlException: Invalid connection.'
any one can detect and solve it then it would be great help.
thx.
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Apr 1, 2008
Hi All,
Now i am using window authentication to login to SQL2005 Express. Everything is fine when I logged with administrator.
But if I use normal user to log in, then I can not connect to SQL database, even I am using user instance. I got the error message is:
Microsoft SQL Native Client (0x80004005)
Invalid connection string attribute
My connection String is:
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Jan 7, 2008
Hi all,
We have recently been having some problems with our server, and im stuck for ideas of what to try next!
Basically we have a busy period every 2 hours where we have many records that need to be processed etc, but we are getting an error coming back saying 'Invalid connection string attribute'.
Now this would be fine but we are using a UDL and 80% of the records are going in fine and its just this few that are coming back with this error. This happens at 3mins and 55 secs past the hour everytime too.
Now i ran SQL profiler over this time and there are records and such being processed fine, then all of a sudden at 3min and 55 secs past there is a mass 'Audit Logout' noted in profiler.
It would seem to me it has nothing to do with the connection string as it was working perfectly fine before.
The processing is done using a VB6 dll being called through ASP on IIS 6.
Does anyone have any ideas on what to try next or advice?
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Sep 4, 2006
Hi.
I'm using SQLXMLBulkLoad to insert data into the SQL database. It worked with the test database on my PC but when I changed it into a VPS it throws an error: Invalid Connection String. This connection string that I used worked in my program before the addition of 'provider = sqloledb'.
Here's the connection string:
@"Provider = sqloledb; Data Source=CRM;Initial Catalog=Works;Persist Security Info=True;User ID=userid;Password=password;Asynchronous Processing=True";
Anyone?
heres the error code:
-2147217887
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Jan 25, 2008
Hi friends,
I have developed a website and uploaded the database to Remote server through Export wizard in Sqlserver 2005.everything is working fine in Sqlserver enterprise manager, but when i tried to connect this database via web.config file to my website it is giving me error...
Server Error in '/Sales_offer' Application.
Invalid connection. 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: Invalid connection.Source Error:
Line 29: {
Line 30: SqlCommand mycmd=new SqlCommand("select distinct(city) from master order by city asc",myconn);
Line 31: myconn.Open();
Line 32: SqlDataReader sdr=mycmd.ExecuteReader();
Line 33: ArrayList arr=new ArrayList();Source File: d:inetpubwwwrootsales_offerindex.aspx.cs Line: 31 Stack Trace:
[SqlException: Invalid connection.]
System.Data.SqlClient.ConnectionPool.GetConnection(Boolean& isInTransaction)
System.Data.SqlClient.SqlConnectionPoolManager.GetPooledConnection(SqlConnectionString options, Boolean& isInTransaction)
System.Data.SqlClient.SqlConnection.Open()
Sales_offer.WebForm1.bind() in d:inetpubwwwrootsales_offerindex.aspx.cs:31
Sales_offer.WebForm1.Page_Load(Object sender, EventArgs e) in d:inetpubwwwrootsales_offerindex.aspx.cs:67
System.Web.UI.Control.OnLoad(EventArgs e)
System.Web.UI.Control.LoadRecursive()
System.Web.UI.Page.ProcessRequestMain()
Version Information: Microsoft .NET Framework Version:1.1.4322.2032; ASP.NET Version:1.1.4322.2032
After that when i tried to access the database through Qury analyzer it is giving me error
Msg 911, Level 16, State 1, Line 1
Could not locate entry in sysdatabases for database 'salecumoffers'. No entry found with that name. Make sure that the name is entered correctly.
But it is showing me the tables and their Contents from Remote server in enterprise manager...
waiting for ur quick response
Neeraj
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Apr 12, 2007
Hi, I had an old web application created during asp.net 1.1 and it have a connection problem with the sql server 2005 when it is mirgrated to a new webserver with dotnet framework 2.0 platform. I have enabled the remote access(TCP/IP and named pipes) in sql server 2005, did all the neccessary things, check whether the TCP/IP is enabled, named pipe is enabled... I created another web application using VS 2005. The database connection works perfectly well.This are the connectionString from the old web application.<appSettings> <add key="ConnectionString" value="Server=127.0.0.1;Database=somedb;User id=user; Password=somepassword; Trusted_Connection=False; POOLING=FALSE"/></appSettings> Thankyou in advance!
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Nov 1, 2007
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Sep 22, 2007
Hi,
I hope this is right place to ask for help.If it is not, Please show me where and if it is please Help me
I using Window Vista bussiness, Microsoft visual 2005 professional edition, Microsoft SQL server express edtion
I have created table on Database.
My sql server name is KYAW-HQ
**but in the bar it shown like as KYAW-HQSQLEXPRESS
My data base name is kyaw
I have already Enabled Name Pipes and TCP/IP setting in sql studio management tool express
I using window authentication to log in to sql server management studio express.
My coding for c# is as follow:
private void button4_Click(object sender, EventArgs e)
{
//connect sql connection
SqlConnection con = new SqlConnection("Server=KYAW-HQ;Database=kyaw;UID=;PWD=;");
//open sql conection
con.Open();
SqlDataAdapter ad = new SqlDataAdapter("Select * From kyaw", con);
DataSet ds = new DataSet();
ad.Fill(ds, "kyaw");
dataGridView1.DataSource = ds.Tables[0].DefaultView;
con.Close();
}
After I click the button the error has shown like below
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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server).
Please tell me what i have to do.
If someone read me, please tell me and advice me how to fix above problem.
Thanks
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Jan 22, 2008
Hello!
This code sample stops when I try to open a connection (see below). Ther error message reads "pipe provider , error 40". The help suggests that the credentials are wrong. I donīt think so, could there be another problem? Tough question but, I would appreciate any help.
System.Data.SqlClient.SqlConnection sqlConnection1 =
new System.Data.SqlClient.SqlConnection(ConfigurationManager.ConnectionStrings["SwimAdminConnectionString"].ConnectionString);
System.Data.SqlClient.SqlCommand cmd = new System.Data.SqlClient.SqlCommand();
cmd.CommandType = System.Data.CommandType.Text;
string sql1 = Session["txtFirstName"].ToString();
string sql2 = Session["txtLastName"].ToString();
cmd.CommandText = "INSERT dbo.Member (mbrFirstName, mbrLastName) VALUES (sql1, sql2)";
cmd.Connection = sqlConnection1;
sqlConnection1.Open(); //EXCEPTION HERE!!!
cmd.ExecuteNonQuery();
sqlConnection1.Close();
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Feb 14, 2006
Whenever I use "User Instance=True" as in the connection string below, I get an invalid connection string error. If I take it out, the connection string generates other errors.
"Provider=SQLNCLI.1;Integrated Security=SSPI;Persist Security Info=False;User Instance=True;AttachDBFileName=|DataDirectory|DbName.mdf;Data Source=.\sqlexpress;"
Removing User Instance=True always eliminates the invalid connection string message.
BTW, I tried both Data Source=.\sqlexpress and Data Source=.sqlexpress.
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Nov 25, 2007
Hi, Has somebody had a problem like this before? 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: Named Pipes Provider, error: 40 - Could not
open a connection to SQL Server) That's part of the code: SqlConnection con; string sql; SqlCommand cmd; con=new SqlConnection("Data Source=elf/SQLEXPRESS;Initial Catalog=logos;Integrated Security=SSPI;"); sql="SELECT max(id_kandydat) from Kandydat"; con.Open(); cmd=new SqlCommand(sql,con); int id = Convert.ToInt32(cmd.ExecuteScalar()); con.Close(); SqlDataSource7.InsertCommand="INSERT INTO Kandydat_na_Kierunek(id_kandydat, id_kierunku, id_stan) VALUES ("+"'"+id+"'"+","+"'"+DropDownList1.SelectedValue+"'"+","+'1'+");"; I don't really get it. I'm nearly 100% sure that before some changes in my project this had worked perfectly. Does anybody have any idea how to make it work again? I would be very grateful for any help. And, yesy, I know it is quite common error, but proposed solution found didn't help.Regards,N.
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Mar 20, 2008
Hello, I have always closed my db connections asap after opening them and have always thought this was the best practice. But now I am wondering if I can just leave the connection open.
I created a windows service which runs on a timer and executes every 5 seconds. The problem is that the code takes longer than that to process and the code may be executing three times at once. Im worried that since I use the same connection each time the code executes that a connection opened by the first run through may be closed or reopened by the second or third running of the code resulting in an error. The connection is opened and closed about 10 times each time the timer event fires. Should I open the connection once and leave it open when the service is started and close it when it is stopped or on any error?
Thanks
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Jun 3, 2008
i m getting this exception
"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: Named Pipes Provider, error: 40 - Could not open a connection to SQL Server)"
i want to know that this exception is from my end or on Server End. because 5 to 6 month my application works fine but in these days i m getting this exception 5 to 20 times a day
your help will really appricate...
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Jun 14, 2006
hi to all,
I create a web application in asp.net with sql server 2000, I use always close connection in .net code as my consern but when run my application then visit page to page give a error "General network error " message . then i check lots of connection is sleeping state in process info in sql manegment(current activity) Now i open the particular processId in Process info show open connection with any storeprocedure name and show .net sqlclient data provoider referance as open connection which is fetch the data from sql then i check in code find really the connection which is got data by that store procedure is not close properly and i close it. This is ok but one problem is that some procesId show blank info with .net sql client data provoider. so how can i find where these conneciton is open in my applicaton because this processId doesn't give any clue for it , it show nothing only blank but status is sleeping. If any help have this context then quick feedback.
Thanks
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