WAPPC32 Ignores User ID Provided By APPC App On Consecutive Allocate Requests (218165)


The information in this article applies to:

  • Microsoft SNA Server 4.0
This article was previously published under Q218165

SYMPTOMS

If the host supports LU6.2 persistent verification or already verified security, and an APPC application calls TP_STARTED once, followed by multiple [MC_]ALLOCATE requests for consecutive conversations, the User ID provided in subsequent [MC_]ALLOCATE requests may be ignored, causing the persistent verification session to be used.

However, if the APPC application issues a new TP_STARTED for every [MC_]ALLOCATE request, this problem does not occur.

CAUSE

The Wappc32.dll file was failing to clear the user_id field on subsequent allocation requests (where security=AP_SAME) made over an LU6.2 session that supports persistent verification or already verified security.

RESOLUTION

SNA Server 4.0

To resolve this problem, obtain the latest service pack for SNA Server version 4.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

215838 How to Obtain the Latest SNA Server Version 4.0 Service Pack


SNA Server 3.0

To resolve this problem, obtain the latest service pack for SNA Server version 3.0. For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

184307 How to Obtain the Latest SNA Server Version 3.0 Service Pack


STATUS

Microsoft has confirmed that this is a problem in SNA Server versions 3.0 and 4.0. This problem was first corrected in SNA Server version 3.0 Service Pack 4 and SNA Server version 4.0 Service Pack 3.

MORE INFORMATION

APPC applications which call TP_STARTED before every [MC_]ALLOCATE will not encounter this problem.

This problem occurs in the following conditions:

  • The LU6.2 session supports either "persistent verification" or "already verified" security.
  • The APPC application must call TP_STARTED once, followed by consecutive [MC_]ALLOCATE requests, with security = AP_SAME and a user_id and password is specified.
The SNA Server APPC API and message traces will reveal the following behavior. In this case, the APPC application issues three consecutive MC_ALLOCATE requests with security=AP_SAME along with userID and password on a session that supports persistent verification. But, the Wappc32.dll file appears to resend the initial user ID over and over, ignoring the user ID provided by the application:

  1. APPC app issues MC_ALLOCATE, sends userid = WNW039, password = WHYNOT1, FMH-5 includes userid = WNW039, password = WHYNOT1
  2. APPC app issues MC_ALLOCATE, sends userid = WNWXXX, password = YYYY, FMH-5 includes userid = WNW039, password = YYYY
  3. APPC app issues MC_ALLOCATE, sends userid = XXXX, password = ZZZZZ, FMH-5 includes userid = WNW039, password = ZZZZZ
Note that the APPC DLL always sends the same user ID, ignoring the user ID provided in the verb control block by the application.
Modification Type:MajorLast Reviewed:10/31/2003
Keywords:kbbug kbfix kbQFE kbsna300sp4fix kbsna400sp3fix KB218165
©2003 Microsoft Corporation. All rights reserved.