Knowledge Base

DSPU Reconnect Failure After An Outage

Article ID: 163519

Article Last Modified on 11/26/2003

Microsoft SNA Server 2.0
Microsoft SNA Server 2.1
Microsoft SNA Server 3.0
Microsoft SNA Server 2.11 Service Pack 1

This article was previously published under Q163519

SYMPTOMS

Downstream physical unit (DSPU) fails to recover its connection to SNA Server after a link failure between the two devices.

CAUSE

When SNA Server receives a format 3 XID from an incoming DSPU that specifies a secondary link station role without preceding it with a negotiable XID, the SNA Server may cause a SABM(E) to be sent immediately without first sending its own format 3 XID. This causes the DSPU to drop the connection.

RESOLUTION

An update to SNA Server ensures that SNA Server always sends at least one non-NULL XID.

STATUS

Microsoft has confirmed this to be a problem in SNA Server versions 2.0, 2.1, 2.11 and 2.11 Service Pack 1 (SP1).
This problem was corrected in the latest Microsoft SNA Server 2.11 U.S. Service Pack. For information on obtaining the 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: prodsna

Keywords: kbbug kbfix kbnetwork KB163519