Source: Microsoft Support

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On a BizTalk server, you may notice the following symptoms:

• The following events may be logged in the Application Event logs:

• The BizTalk Server fails to restart or shutdown. When rebooting the computer, it may just hang and the mouse may not move. These symptoms may occur for an extended period of time and the computer may not shut down. There are no errors in the event log.

These issues can occur because of TCP/IP changes in Windows Server 2003 and later.

There are several items to implement to stop the errors from occurring:

1. On the SQL server running on Windows Server 2003, set the SynAttackProtect registry key using the steps in Microsoft Knowledge Base (KB) article 899599:
   
   899599 (http://support.microsoft.com/?id=899599) A BizTalk Server Host instance fails, and a "General Network" error is written to the Application log when the BizTalk Server-based server processes a high volume of documents
   
   Note The SynAttackProtect registry key is not applicable on Windows Server 2008 and Windows Server 2008 R2. For a list of the registry keys on these operating systems, visit the following link:
   
   TCP/IP Registry Values for Microsoft Windows Vista and Windows Server 2008 (http://www.microsoft.com/downloads/en/details.aspx?familyid=12AC9780-17B5-480C-AEF7-5C0BDE9060B0&displaylang=en)
2. On all the BizTalk and SQL servers running on Windows Server 2003, use the steps in KB article 948496 to disable the Scalable Networking Pack (SNP) features:
   
   948496 (http://support.microsoft.com/?id=948496) An update to turn off default SNP features is available for Windows Server 2003-based and Small Business Server 2003-based computers
   
   To disable TCP Chimney Offload feature of the Scalable Networking Pack (SNP), you can also install the hotfix in KB article 940202:
   
   940202 (http://support.microsoft.com/?id=940202) A Windows Server 2003-based computer may stop responding during shutdown after you install the Scalable Networking Pack
   
   On all the BizTalk and SQL servers running on Windows Server 2008, use the steps in KB article 951037 to disable Receive Side Scaling (RSS) and the TCP Chimney Offload features of the Scalable Networking Pack (SNP):
   
   951037 (http://support.microsoft.com/?id=951037) Information about the TCP Chimney Offload, Receive Side Scaling, and Network Direct Memory Access features in Windows Server 2008
3. On all BizTalk servers running on Windows Server 2003, increase the ephemeral ports and reduce the TCP reuse timeout setting by modifying the MaxUserPort and TCPTimedWaitDelay registry keys documented at the link below:
   
   BizTalk Server Database Optimization (http://msdn.microsoft.com/en-us/library/bb743398.aspx)
   
   You can modify these settings at the HKLM\SYSTEM\CurrentControlSet\Services\Tcpip\Parameters registry key. The table below lists the recommended values:
   
   
   Collapse this tableExpand this table

   Value name	Value	Comment
   MaxUserPort	0xFFFE (65534)	Prevents port exhaustion
   TcpTimedWaitDelay	0x1E (30)	Release unused ports as quickly as possible

   
   On all BizTalk servers running on Windows Server 2008, we recommend not modifying the dynamic port range. If you determine that additional dynamic ports are needed, refer to KB article 929851:
   929851  (http://kbalertz.com/Feedback.aspx?kbNumber=929851/ ) The default dynamic port range for TCP/IP has changed in Windows Vista and in Windows Server 2008
   
   The TCP reuse timeout setting can also be reduced by modifying the TCPTimedWaitDelay registry key. For more information on this registry key in Windows Server 2003, refer to the following site:
   
   TCP TIME-WAIT Delay (http://msdn.microsoft.com/en-us/library/ms819739.aspx)
   
   For more information on this registry key on Windows Server 2008, refer to the following site: 
   
   TCP/IP Registry Values for Microsoft Windows Vista and Windows Server 2008 (http://www.microsoft.com/downloads/en/details.aspx?familyid=12AC9780-17B5-480C-AEF7-5C0BDE9060B0&displaylang=en)
4. On all the BizTalk and SQL servers running on Windows Server 2003, use the steps in KB article 906736 to disable Privilege Attribute Certificate (PAC) verification. On all BizTalk and SQL servers running on Windows Server 2008, refer to KB article 906736 for more information on Privilege Attribute Certificate (PAC) verification.
   906736  (http://kbalertz.com/Feedback.aspx?kbNumber=906736/ ) You experience a delay in the user-authentication process when you run a high-volume server program on a domain member in Windows 2000 or Windows Server 2003

RESTART REQUIREMENT

You must restart your computer after implementing the changes above.

TCP/IP settings can also be configured using the Network shell (netsh) command-line utility at a Windows command prompt with administrator-level permissions. Refer to the following link for more information:

Netsh Technical Reference (http://technet.microsoft.com/en-us/library/cc725935(WS.10).aspx)

The KB articles below also reference General Network Errors:

328476 (http://support.microsoft.com/?id=328476)  Description of TCP/IP settings that you may have to adjust when SQL Server connection pooling is disabled
319502 (http://support.microsoft.com/?id=319502)  PRB: "WSAEADDRESSINUSE" Error Message When You Try to Connect Through an Anonymous Port After You Increase the IMAP Connection Limit

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