Article ID: 300519 - View products that this article applies to.
This article was previously published under Q300519
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When you are using Microsoft Data Access Components (MDAC) version 2.6 from a client application to connect to a SQL Server 7.0 database, the client application may start to experience login timeouts, "Timeout expired" errors, or general network errors. This occurs when the client application is experiencing a high volume of connect and disconnect activity and a large portion of the connections are invalid. Pooling in the Microsoft Data Access Components
For more information, click the following article numbers to view the articles in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/166083/ )INF: How to enable connection pooling in an OLE DB application
(http://support.microsoft.com/kb/228843/ )How to implement session pooling from Visual Basic ADO program
To work around this problem, Microsoft recommends that you use MDAC OLEDB/ODBC pooling functionality. This will reduce the number of physical connections that are open and connection attempts being made to the database and should prevent the problem from occurring.
This problem also does not occur when you are connecting to a SQL Server 2000 database.
SQL Server 7.0To resolve this problem, obtain the latest service pack for Microsoft SQL Server 7.0. For more information, click the following article number to view the article in the Microsoft Knowledge Base:
(http://support.microsoft.com/kb/301511/ )How to obtain the latest SQL Server 7.0 service pack
Microsoft has confirmed that this is a problem in the Microsoft products that are listed in the "Applies to" section.
SQL Server 7.0
This problem was first corrected in Microsoft SQL Server 7.0 Service Pack 4.