Knowledge Base

TN3270E May Experience Unexpected Application Exception Errors

Article ID: 151202

Article Last Modified on 11/19/2003

Microsoft SNA Server 3.0, when used with:
- Microsoft Windows NT 4.0
Microsoft SNA Server 2.11 Service Pack 1, when used with:
- Microsoft Windows NT 4.0

This article was previously published under Q151202

SYMPTOMS

The SNA Server 2.11 Service Pack 1 Tn3270E Server may experience intermittent and random access violations.

If this occurs, the SNA Server TN3270E service will log the following event in the Microsoft Windows NT application event log:

Event Id:5
The TN3270E Service has abnormally terminated.

EXPLANATION
An exception (0xC0000005) has occurred that has caused the TN3270E
Service to terminate.

ACTION
Record message and contact technical support.

CAUSE

The TN3270E Server user license validation routine was accessing the global queue of session control blocks without using a critical section to serialize access to the queue. This leaves a chance that while it is accessing a control block that control block could be deleted by another thread.

STATUS

Microsoft has confirmed this to be a problem in Microsoft SNA Server versions 2.11 and 2.11.sp1. A fix to this problem is in development, but has not been regression-tested and may be destabilizing in production environments. Microsoft does not recommend implementing this fix at this time. Contact Microsoft Product Support Services for more information on the availability of this fix.

Additional query words: prodsna tn3270

Keywords: kbbug kbnetwork KB151202