X.25 PU Passthrough Drops Transmission Header

ID: Q189501

The information in this article applies to:

Microsoft SNA Server, versions 4.0, 4.0 SP1

SYMPTOMS

Setting up PU Passthrough to IBMX25 link service fails to establish a session, because the Transmission Header is dropped from all SNA messages transmitted across the X.25 network.

CAUSE

This is a result of the IBMX25 link service, when it checks the wrong byte in the Open Station for FID-2 support. Because of other settings in the Open Station message, this situation is only seen when using PU Passthrough.

RESOLUTION

Microsoft has confirmed this to be a problem in Microsoft SNA Server version 4.0 and 4.0 SP1. 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

Additional query words:

Keywords :
Version : WINDOWS:4.0,4.0 SP1
Platform : WINDOWS
Issue type : kbbug