Microsoft KB Archive/162491

= SNA Server Performance Degrades with Event 631 Errors =

Article ID: 162491

Article Last Modified on 11/19/2003

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APPLIES TO


 * Microsoft SNA Server 3.0
 * Microsoft SNA Server 2.11 Service Pack 1
 * Microsoft SNA Server 3.0 Service Pack 4

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This article was previously published under Q162491





SYMPTOMS
SNA client response is slow, and at the same time SNA Server or SnaBase reports multiple Event 631 errors (from 10-30 per second) in the Windows NT application event log:

Event: 631

Source: SNA Server (or SnaBase)

Description: Invalid message received across the LAN:

remote:  msgid 0x0 incorrect or msgtype 1

too high (max 33)

All Event 631 errors are reported from the same client address and client port number.



CAUSE
Event 631 is logged by SNA Server (or SnaBase) whenever it receives an improperly formatted message from an SNA Server client emulator over an existing client TCP/IP socket. The cause of this client behavior is under investigation.



RESOLUTION
An update to SNA Server 2.11 SP1 and SNA Server 3.0 changes the way that invalid client messages are handled. Instead of reporting an Event 631 on each invalid message, this update causes SNA Server (or SnaBase) to:


 * report a single Event 631 for this client port, and
 * close the TCP/IP socket to this client.



STATUS
Microsoft has confirmed this to be a problem in SNA Server version 2.11, 2.11 SP1 and 3.0. A supported fix for SNA Server 2.11 SP1 and 3.0 is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next Service Pack that contains this fix. Contact Microsoft Technical Support for more information.

Additional query words: prodsna

Keywords: kbnetwork KB162491

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