Starting SNA Server Causes Computer to Slow Down

Last reviewed: April 23, 1996
Article ID: Q116408

The information in this article applies to:

Microsoft SNA Server for Windows NT, version 2.0

After you install Windows NT SNA Server, several default shares are created with permissions set to EVERYONE FULL CONTROL. Changing permissions on these directories to something else can cause the SNA product to not function correctly. One symptom of this is that the system slows down when you start Windows NT after you have modified permissions on the COMCFG share or file privileges on the COM.CFG file.

SNA Server services (SnaBase, SnaServer, Link services) run under the local system context and access the CONFIG file through UNC names (\\SERVER\COMCFG\COM.CFG). If the EVERYONE users doesn't have full control access, this causes the services to go into a loop trying to open COM.CFG.

SNA Patch #8 (SNA20.P08 - update to SNADMOD.DLL) is modified to display a dialog box that says COM.CFG cannot be opened, thus allowing the Windows NT server to perform as usual. Later updates to the SNA Server 2.0 SNADMOD.DLL will also include this fix.

SNA Server 2.0 patches are located on:

   - Microsoft's Internet Server (FTP.MICROSOFT.COM)
     - BUSSYS\SNASRVR\SUP-ED\FIXES (supported)
     - BUSSYS\SNASRVR\UNSUP-ED\FIXES (unsupported)

Also, various hotfixed versions of Windows NT version 3.1 include an updated SRV.SYS which will lead to similar problems mentioned above. The original release of Windows NT version 3.1, and all official Service Pack #1 and #2 updates work fine.

However, the following version of <winnt>\SYSTEM32\DRIVERS\SRV.SYS should be avoided:

   U.S. Service Pack 2a version (shipped on the August and September 1994
   TechNet CD-ROM), which has a size of 193748.

This problem is corrected by applying the regular U.S. Service Pack 2 or U.S. Service Pack 3, which has a size of 193732.

Additional reference words: prodsna 2.00
KBCategory: kbnetwork kbbug2.00 kbfix2.00
KBSubcategory: ntnetserv

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Last reviewed: April 23, 1996
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