This article was previously published under Q195566
Retired KB Content Disclaimer
This article was written about products for which Microsoft no longer offers support. Therefore, this article is offered "as is" and will no longer be updated.
The following error message is returned from the ODBC Data Source Administrator and/or an ODBC application while attempting to make a connection to SQL Server:
Connection failed: SQLState: '08001' SQL Server Error: 11 [Microsoft][ODBC SQL Server Driver][DBMSSOCN] General Network error. Check your documentation.
Connection failed: SQLState: '01000' SQL Server Error: 10061 [Microsoft][ODBC SQL Server Driver][DBMSSOCN]ConnectionOpen(connect())
Connection failed: SQLState: 08001 SQL Server Error: 11 [Microsoft][ODBC SQL Server Driver][TCP/IP Sockets]General network error. Check your network documentation.
Connection failed: SQLState: 01000 SQL Server Error: 10061 [Microsoft][ODBC SQL Server Driver][TCP/IP Sockets]ConnectionOpen (connect())
The most common reason that this connection attempt failed is that this DSN or ODBC data source attempted to make a connection using the TCP/IP sockets Net-Library, which is Dbmssocn.dll. Because the SQL Server is not listening for incoming connections for TCP/IP sockets clients, the connection fails. From ISQL/w, the second error message stated above would be returned. The OS Error is 10061, and the function call that failed was ConnectionOpen(connect()).
By default, SQL Server will listen for incoming connections made by Named Pipes clients. Named Pipes is the default IPC mechanism for clients to connect to a SQL Server version 4.2, 6.0, and 6.5 server. The Named Pipes DLL is Dbnmpntw.dll, and it should be located in the Windows\System or Winnt\System32 directory. The TCP/IP sockets netlib DLL is Dbmssocn.dll, and also should be in the Windows\System or Winnt\System32 directory.The most common resolution to this problem is to configure the client computer to connect using Named Pipes.
Configuring Named Pipes
If the Microsoft Data Access Components (MDAC) ODBC drivers have been installed on the computer, you can make this change in the second step of the Create New Data Source wizard.
To configure the client, start the Create New Data Source wizard, click the Client Configuration button, and perform the following steps, based on the version of the SQL Server ODBC driver you are using:
For SQL Server ODBC Driver version 3.50
Click the Net Library tab and use the drop down list box to set the default network (Net Library) to Named Pipes.
On the Advanced tab, remove any advanced entries that reference the server you are connecting to.
For SQL Server ODBC Driver version 3.70
In the Network Libraries section of the Edit Network Library Configuration dialog box, select Named Pipes.
If you do not have the MDAC ODBC drivers installed, you can use the SQL Server Client Configuration Utility tool to set the default Net-Library to Named Pipes. You can install the client utilities from the SQL Server CD from the i386 directory.
Configuring TCP/IP Sockets
In order for a client to connect to the SQL Server over TCP/IP sockets, the server needs to be listening on the server side sockets library. To add TCP/IP sockets support run SQL Setup.
Press Continue again.
Select Change Network Support
Select TCP/IP Sockets
Press Continue to accept the default Pipe Name and TCP/IP socket port 1433.
Stop and restart the MSSQLServer service.
In order for you to confirm that your SQL Server is listening for incoming sockets connections, the following line should be in the current SQL Server error log found in \mssql\log.
ods Using 'SSMSSO60.DLL' version '22.214.171.124' to listen on '1433'.
To configure the client, start the Create New Data Source wizard, click Client Configuration, and perform the following steps, based on the version of the SQL Server ODBC driver you are using:
For SQL Server ODBC Driver version 3.50:
Click the Net Library tab and use the drop down list box to set the default network (Net Library) to TCP/IP Sockets.
Leave the default Net Library set to Named Pipes and on the Advanced tab, add a new entry where:
Server := SQL Server Name Network:= TCP/IP Sockets Connection String: = IP Address,1433 (There are no spaces between the IP Address, the comma, and the port 1433)
For SQL Server ODBC Driver version 3.70:
In the Network Libraries section of the Edit Network Library Configuration dialog box, select TCP/IP.
Enter the name of the SQL Server into the Server alias textbox
Change the Computer name to the actual IP address of the SQL Server.
Type 1433 in the port number textbox
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