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If you've just upgraded to Exchange Server 2003 Service Pack 2 and have enabled Sender ID filtering, you need to apply a hotfix to prevent the server from stopping to respond.
According to the KBA, the problem occurs because of a race condition caused by the SMTP protocol. A race condition occurs when a device or a system tries to perform two or more operations at the same time. Because of the nature of the device or system, the operations must be performed in the correct sequence in order to be completed correctly.
Windows Server 2003: http://support.microsoft.com/default.aspx?scid=kb;en-us;905214
Windows 2000 Server: http://support.microsoft.com/default.aspx?scid=kb;en-us;909426
[No hotfix available yet for Windows 2000]
Interestingly, the Windows 2000 version of the KBA (909426) was released on Oct. 17 with revision 1.0, 2 days before the public release of Service Pack 2 on Oct. 19.
The Windows Server 2003 version (905214) was last revised on Oct. 21 and is currently at revision 3.0.
According to the KBA, the problem occurs because of a race condition caused by the SMTP protocol. A race condition occurs when a device or a system tries to perform two or more operations at the same time. Because of the nature of the device or system, the operations must be performed in the correct sequence in order to be completed correctly.
Windows Server 2003: http://support.microsoft.com/default.aspx?scid=kb;en-us;905214
Windows 2000 Server: http://support.microsoft.com/default.aspx?scid=kb;en-us;909426
[No hotfix available yet for Windows 2000]
Interestingly, the Windows 2000 version of the KBA (909426) was released on Oct. 17 with revision 1.0, 2 days before the public release of Service Pack 2 on Oct. 19.
The Windows Server 2003 version (905214) was last revised on Oct. 21 and is currently at revision 3.0.
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