COMTI [MC_]ALLOCATE Hangs After Host Rejects SNA Server BIND Request (218173)

SYMPTOMS

A COM Transaction Integrator (COMTI) request may stop responding (hang) and fail to complete if the host rejects SNA Server's BIND request. Although this problem has been observed when using COMTI, this problem can occur with any APPC or CPIC application that attempts to allocate a conversation by setting rtn_ctl = AP_WHEN_CONWINNER_ALLOCATED (to request an LU6.2 conversation over a contention winner session).

NOTE: The COMTI feature included in SNA Server 4.0, 4.0 SP1, and 4.0 SP2 only requests contention winner sessions.

CAUSE

The SNA Server was failing to de-queue a client allocation request for a contention winner session when the remote system rejects the request. This occurs only when the host has also initiated LU6.2 sessions to SNA Server where SNA Server is the contention loser.

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

WORKAROUND

The problem can be avoided by correcting the host system configuration to prevent the SNA Server BIND request from being rejected. When this problem occurs, the host successfully establishes LU6.2 sessions where SNA Server is the contention loser, but rejects SNA Server requests to establish an LU6.2 contention winner session.

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.