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Also, when you have this problem, general connectivity to SQL Server works one instant, fails the next, then works again the next instant. The computer may run for hours with no errors, then the error occurs one or two times, and the computer then runs for several more hours with no errors. However, with a stress-related socket issue, the problem occurs intermittently as the stress rises and falls. Basically anything that can cause the client to fail to open a TCP/IP socket to the computer that is running SQL Server can also cause the error messages. Note that you can also receive these specific error messages when other problems are occurring with SQL Server for example, you may receive these error messages if the remote computer that is running SQL Server is shut down, if the remote computer that is running SQL Server is not listening to TCP/IP sockets at all, if network connectivity to the computer that is running SQL Server is broken because the network cable is pulled out, or if you are having DNS resolution issues.
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TCP Provider: Only one usage of each socket address (protocol/network address/port) is normally permitted. Note that when you see these stress-related TCP/IP socket issues with the SQL Server network libraries, you may receive one or more of the following error messages when you try to connect to a computer that is running SQL Server: With pooling disabled, the same sample test generated 225,129 TCP/IP network packets, for a total of 27,209,622 bytes of network activity. For example, a sample test that used 20,000 SQL Server connection opens and closes with pooling enabled used about 160 TCP/IP network packets, for a total of 23,520 bytes of network activity. Using pooling also considerably reduces network traffic to the computer that is running SQL Server. Using pooling greatly improves overall performance on both the client side and SQL Server side when you use the SQL Server drivers. Note that Microsoft strongly recommends that you always use pooling with the SQL Server drivers. If you do not understand the topics in this article, Microsoft recommends that you see a good book about TCP/IP sockets. Turning off pooling can also cause stress-related problems with other SQL Server protocols such as named pipes, but this article does not discuss this topic. Note that this article only discusses settings that affect the SQL Server network library when you use the TCP/IP protocol. You may have to change default TCP/IP socket settings for the operating system and the computer that is running SQL Server to deal with the higher stress levels.
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#SQL SERVER DEFAULT PORT DRIVER#
Turning off pooling can cause the underlying SQL Server network driver to rapidly open and close new socket connections to the computer that is running SQL Server. This article describes certain TCP/IP settings that you may have to adjust under these conditions. When you disable pooling, the stress on the underlying SQL Server network library may be increased if your application frequently opens and closes connections. When you use the SQL Server ODBC driver, the SQL Server OLE DB provider, or the managed provider, you can disable connection pooling by using the respective application programming interfaces (APIs). Microsoft SQL Server 2005 Standard Edition Microsoft SQL Server 2005 Developer Edition Microsoft SQL Server 2005 Enterprise Edition Microsoft SQL Server 2005 Express Edition Microsoft SQL Server 2005 Workgroup Edition More.