SNA Server 3.0 SP1 Update May Break Named Pipe Clients (167196)

IMPORTANT: This article contains information about modifying the registry. Before you modify the registry, make sure to back it up and make sure that you understand how to restore the registry if a problem occurs. For information about how to back up, restore, and edit the registry, click the following article number to view the article in the Microsoft Knowledge Base:

256986 Description of the Microsoft Windows Registry

SYMPTOMS

After you apply SNA Server 3.0 Service Pack 1, named pipe clients may be unable to get sponsor connections to the computer running SNA Server. When you start the SnaBase service on an SNA Server Windows NT 3.x client configured to use Microsoft Networking (Named Pipes), the following error message appears:

SNA Server - Error # 1003

SNABase Could Not open Sponsor Connection To Server <servername>.

This problem does not occur if the sponsor connection is configured to a SNA Server 3.0 Server (Service Pack 1 not applied) or if TCP/IP is selected in the "Select Client/Server Protocol for Client Setup" dialog box on the client.

NOTE: This error message can appear for other reasons as well.

CAUSE

The SNA Server 3.0 Service Pack 1 update program updates the NullSessionPipes registry value, but fails to correctly add null- termination to the end of the last entry:

   HKEY_LOCAL_MACHINE\System\ 
   CurrentControlSet\Services\LanmanServer\Parameters\ 
   NullSessionPipes:REG_MULTI_SZ:

   COMNAP
   COMNODE
   SQL\QUERY
   SPOOLSS
   LLSRPC
   EPMAPPER
   LOCATOR
   COMPROXY
   COMNETM

The last character of the last entry has been truncated, and is missing the terminating carriage return.

RESOLUTION

To work around this problem:

WARNING: Using Registry Editor incorrectly can cause serious, system-wide problems that may require you to reinstall Windows NT to correct them. Microsoft cannot guarantee that any problems resulting from the use of Registry Editor can be solved. Use this tool at your own risk.

Start Registry Editor (Regedt32.exe).

Under the HKEY_LOCAL_MACHINE subtree, go to the following subkey:

System\CurrentControlSet\Services\LanmanServer\Parameters\

Double-click NullSessionPipes.
Change the last entry to COMNETMN and press ENTER.
Click OK.
Perform a shutdown and restart of Windows NT for the change to take effect.

STATUS

Microsoft has confirmed this to be a problem in SNA Server 3.0 SP1. This problem was corrected in the latest SNA Server version 3.0 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