Event 60, SNA Server Stops Forwarding FMH-5 Attach Messages

ID: Q182574

The information in this article applies to:

Microsoft SNA Server, versions 3.0, 3.0 SP1, 3.0 SP2, 4.0

SYMPTOMS

SNA Server may unexpectedly stop forwarding FMH-5 Attach messages to a specific branch-based SNA Server client computer (where the invokable transaction program [TP] is registered or running). When this occurs, SNA Server reports an Event 60 (DLOAD timeout) in the server's application log. For example:


   Event ID: 60
   Source:   SNA Server
   Description: Failed to invoke APPC TP &lt;tpname&gt;, sense
   data = 084C0000

084C0000 refers to AP_TRANS_PGM_NOT_AVAIL_NO_RETRY.

On the client computer, the APPC or CPIC invokable TP may never be invoked, or if it is running, the TP's call to CMAPPC or RECEIVE_ALLOCATE will not complete. To recover from this problem, the SnaBase service on the Windows NT client computer must be stopped and restarted.

CAUSE

This problem can occur when the SNA Server client's sponsor connection (LAN session) to the server-side SnaBase service is lost. This problem occurs when the client-end of the client end of the LAN connection fails first.

If the SNA Server client's sponsor fails and reconnects to the SnaBase before SnaBase is notified of the LAN session failure, a timing window exists where client invokable TP's are deregistered even though the client has reconnected. This problem has also been observed if the client is connecting against two or more SNA Servers, where its client sponsor reconnects against another server after a sponsor connection failure.

This problem has been observed when an SNA Server Windows NT client is connecting to an SNA Server over TCP/IP sockets, although it may occur with other LAN interfaces.

RESOLUTION

SNA Server 3.0

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

Q184307 How to Obtain the Latest SNA Server Version 3.0 Service Pack

SNA Server 4.0

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

WORKAROUND

To work around this problem, determine and correct the cause of the underlying LAN session failure between the SNA Server client and the server.

STATUS

Microsoft has confirmed this to be a problem in SNA Server versions 3.0, 3.0 SP1, 3.0 SP2, and 4.0. This problem was first corrected in SNA Server 3.0 Service Pack 4.

Additional query words:

Keywords : kbbug4.00 kbfix4.00.sp1 snaappc snacpic kbbug3.00 kbbug3.00.sp2 snabaseservice snaserverservice snatp snawinnt
Version : WINDOWS:3.0,3.0 SP1,3.0 SP2,4.0
Platform : WINDOWS
Issue type : kbbug