Microsoft KB Archive/147791

= Small Outbound RU Size Causes Access Violations on TN3270 =

Article ID: 147791

Article Last Modified on 8/11/2005

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APPLIES TO


 * Microsoft SNA Server 3.0

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This article was previously published under Q147791





SYMPTOMS
Unexpected application exceptions occur on the TN3270 server.



CAUSE
When the TN3270 Server processes a BIND, it examines the RU sizes in the BIND. If the RU sizes are larger than the default values (these are configured through the TN3270 Administrator), it reallocates its send and receive buffers. When the TN3270 Server allocates a new outbound data buffer, it releases the old one back to the operating system. However, it still has a pointer to this buffer, which is used to examine the BIND that is occasionally referencing memory already released.



RESOLUTION
Increase the default outbound RU size or apply the SNA Server for Windows NT version 2.11 Service Pack 1.



STATUS
Microsoft has confirmed this to be a problem in SNA Server for Windows NT. This problem was corrected in the latest SNA Server for Windows NT, 2.11 U.S. Service Pack. For information on obtaining the Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Additional query words: prodsna 2.11 3.51 kbbug2.11

Keywords: KB147791

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