Microsoft KB Archive/182265

= APPC Display Call Fails With AP_STATE_CHECK (Primary_rc = 0002) =

Article ID: 182265

Article Last Modified on 5/17/2005

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APPLIES TO


 * Microsoft SNA Server 3.0 Service Pack 4
 * Microsoft SNA Server 4.0
 * Microsoft SNA Server 3.0 Service Pack 2
 * Microsoft SNA Server 4.0

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This article was previously published under Q182265



SYMPTOMS
Occasionally, the APPC DISPLAY function will fail with the following error:

primary_rc = 0x0002 (AP_STATE_CHECK)

secondary_rc = 0x00000000

This problem seems to occur when two separate DISPLAY calls are made at the same time from two different threads of the same APPC program.



CAUSE
Although the APPC DISPLAY function is implemented in a thread-safe manner, it does not properly handle unsolicited status messages received from the SNA Server, which could cause AP_STATE_CHECK to be returned in error. This problem is not related to issuing separate DISPLAY calls from different threads.



STATUS
Microsoft has confirmed this to be a problem in SNA Server 3.0, 3.0 Service Pack 1 (SP1), 3.0 SP2, and 4.0. We are researching this problem in SNA Server version 3.0 and will post new information here in the Microsoft Knowledge Base as it becomes available.

This problem was corrected in the latest SNA Server version 4.0 U.S. Service Pack. For information on obtaining this Service Pack, query on the following word in the Microsoft Knowledge Base (without the spaces):

S E R V P A C K

Keywords: kbbug kbfix kbnetwork KB182265

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