Microsoft KB Archive/899599

= A BizTalk Server Host instance fails, and a &quot;General Network&quot; error is written to the Application log when the BizTalk Server-based server processes a high volume of documents =

Article ID: 899599

Article Last Modified on 6/7/2007

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APPLIES TO


 * Microsoft BizTalk Server 2006 Enterprise Edition
 * Microsoft BizTalk Server 2006 Developer Edition
 * Microsoft BizTalk Server 2006 Standard Edition
 * Microsoft BizTalk Server 2004 Enterprise Edition
 * Microsoft BizTalk Server 2004 Partner Edition
 * Microsoft BizTalk Server 2004 Developer Edition
 * Microsoft BizTalk Server 2004 Standard Edition
 * Microsoft Windows Server 2003 Service Pack 1
 * Microsoft Windows Server 2003 Service Pack 2
 * Microsoft SQL Server 2000 Service Pack 4

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Important This article contains information about how to modify the registry. Make sure that you back up the registry before you modify it. Make sure that you know how to restore the registry if a problem occurs. For more information about how to back up, restore, and modify the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows registry



SYMPTOMS
A Microsoft BizTalk Server Host instance fails and then restarts itself, and errors that are similar to the following are written to the BizTalk Server Application log:

Event Type: Error

Event Source: BizTalk Server 2004

Event Category: (1)

Event ID: 6913

Computer:

Description:, BizTalkMsgBoxDb, [DBNETLIB][ConnectionWrite (send).]General network error. Check your network documentation..

Event Type: Warning

Event Source: BizTalk Server 2004

Event Category: (1)

Event ID: 5410

Computer:

Description: An error has occurred that requires the BizTalk service to terminate. The most common causes are an unexpected out of memory error and an inability to connect or a loss of connectivity to one of the BizTalk databases. The service will shutdown and auto-restart in 1 minute. If the problematic database remains unavailable, this cycle will repeat.

Error message: [DBNETLIB][ConnectionWrite (send).]General network error. Check your network documentation.

Error source:

BizTalk host name: BizTalkHost

BizTalk Windows service name: BTSSvc$BizTalkHost.

This issue typically occurs when the BizTalk Server-based server processes a high volume of documents.



CAUSE
This issue occurs because Microsoft Windows Server 2003 Service Pack 1 (SP1) and Windows Server 2003 Service Pack 2 (SP2) implement a security feature that reduces the size of the queue for concurrent TCP/IP connections to the server. This feature helps prevent denial of service attacks. Under heavy load conditions, the TCP/IP protocol in Windows Server 2003 SP1 and in Windows Server 2003 SP2 may incorrectly identify valid TCP/IP connections as a denial of service attack. This behavior could lead to the issue that is described in the &quot;Symptoms&quot; section.



RESOLUTION
Warning Serious problems might occur if you modify the registry incorrectly by using Registry Editor or by using another method. These problems might require that you reinstall the operating system. Microsoft cannot guarantee that these problems can be solved. Modify the registry at your own risk.

To resolve this issue, turn off this new functionality in Windows Server 2003 SP1 or in Windows Server 2003 SP2 by adding the  entry to the following registry key on the computer that is running Microsoft SQL Server that houses your BizTalk Server databases.

Set the  entry to a DWORD value of 00000000. To do this, follow these steps:  Click Start, click Run, type regedit, and then click OK. Locate and then click the following registry key:

 

 On the Edit menu, point to New, and then click DWORD Value. Type SynAttackProtect, and then press ENTER. On the Edit menu, click Modify. In the Value data box, type 00000000. Click OK.</li> Quit Registry Editor.</li></ol>

Note To complete this registry change, you must restart the computer that is running SQL Server.

<div class="status_section">

STATUS
This behavior is by design.

Keywords: kbprb KB899599

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