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Q163790: RPC Service Stops Responding on UDP Port 135

Article: Q163790
Product(s): Microsoft Windows NT
Version(s): winnt:4.0
Operating System(s): 
Keyword(s): kbnetwork kbRPC kbSDKPlatform kbGrpDSNetkbbuglist kbfixlist
Last Modified: 09-AUG-2001

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The information in this article applies to:

- Microsoft Windows NT Workstation version 4.0 
- Microsoft Windows NT Server version 4.0 
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SYMPTOMS
========

Windows NT 4.0 has the capability to use UDP port 135 for RPC server and client
services. Intermittently, the computer running Windows NT will stop responding
to RPC requests on the UDP port. Windows NT does not inherently use the UDP port
135 for native Windows NT RPC requests; however, there are third party
applications that are designed to use RPC over UDP 135.


CAUSE
=====

Broadcasts from other applications over UDP port 135 cause Windows NT to stop
responding to RPC traffic intended for it.

RESOLUTION
==========

Apply the fix mentioned below. It will replace the Rpcrt.dll file, which has
been fixed.


STATUS
======

Microsoft has confirmed this to be a problem in Windows version 4.0. This
problem was corrected in the latest Microsoft Windows NT 4.0 U.S. Service Pack.
For information on obtaining the service pack, query on the following word in
the Microsoft Knowledge Base (without the spaces):

  S E R V P A C K


Additional query words: prodnt rpc udp

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Keywords          : kbnetwork kbRPC kbSDKPlatform kbGrpDSNet kbbuglist kbfixlist
Technology        : kbWinNTsearch kbWinNTWsearch kbWinNTW400 kbWinNTW400search kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400
Version           : winnt:4.0
Issue type        : kbbug

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