SNARAS Cannot Connect to Heavily Loaded Server

ID: Q162610

The information in this article applies to:

Microsoft SNA Server, versions 2.11, 2.11 SP1

SYMPTOMS

When you attempt to establish an SNARAS connection to an SNARAS server that is heavily loaded over a LAN, the SNARAS client may fail and receive an error message 629:

Port was disconnected by remote machine.

At this point you have the option to cancel or retry. If you click Retry, after about 5 seconds, there is an error message concerning Windows NT RAS Error 651:

Your modem or other device-connecting device has reported an error.

Subsequent attempts by the SNARAS client to establish a connection to the SNARAS server will fail with Windows NT RAS error 651.

CAUSE

SNARAS has two external interfaces: one to AsyncMac and one to APPC. The APPC side of the SNARAS server detects an incoming client and commences the initialization of the AsyncMac side (including creation of a port connected to the AsyncMac device driver). The AsyncMac connection setup is multiphase and, on a heavily loaded server, data arrives from the APPC side before the AsyncMac port initialization has completed. Forwarding this data across the SRI (interface from APPC to SNARAS) and attempting to send it on to AsyncMac fails because the AsyncMac port initialization is not yet complete.

RESOLUTION

Apply the fix referenced below. The updated modules are Snaras.dll and Rassna.dll.

STATUS

Microsoft has confirmed this to be a problem in SNA Server, versions 2.11 and 2.11 Service Pack 1 (SP1). A supported fix is now available, but has not been fully regression-tested and should be applied only to systems experiencing this specific problem. The fix is already included in SNA Server 3.0. Unless you are severely impacted by this specific problem, Microsoft recommends that you wait for the next service pack that contains this fix. Contact Microsoft Technical Support for more information.

Additional query words: prodsna

Keywords : kbnetwork kbbug2.11 kbbug2.11.sp1 kbfix2.11.sp2 snaras
Version : WINDOWS:2.11,2.11 SP1
Platform : WINDOWS
Issue type :