Node Retries Open(Link) on X.25 Even After Error is Reported

• Microsoft SNA Server for Windows NT, versions 2.11

SYMPTOMS

If the SNALink cannot initialize successfully, it responds with an Open (LINK) Error-Response containing an error code. Upon receiving an Open(LINK) Error-Response on a link, the node should not continue to retry connections on that link service. However, in the case of X.25 PVCs (permanent virtual circuits), and SDLC (Synchronous Data Link Control) leased connections, the node continues to retry.

Sample Trace

   at 17:25:41.31 Open Link Request for Link Service SDL2
   at 17:25:41.40 Open Link Request for Link Service QLLC
   at 17:25:41.40 Open Link Response with Error code 01 for SDL2
   at 17:25:41.53 Open Link Response with Error code 01 for QLLC
   at 17:26:01.84 Open Link Request for Link Service SDL2
                                                    (retried every 20 sec.)

CAUSE

The node fails to deal with leased connections correctly. It compares the name of the link service against a list that does not exist for leased connections.

RESOLUTION

The node no longer retries Open(Link)s after any RSPERR on any link type.

STATUS

Microsoft has confirmed this to be a problem in SNA Server for Windows NT. This problem was corrected in the latest SNA Server for Windows NT, 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):