DOCUMENT:Q162567     [winnt]
TITLE   :Telnet to Port 135 Causes 100 Percent CPU Usage
PRODUCT :Microsoft Windows NT
PROD/VER:3.51 4.00
OPER/SYS:WINDOWS
KEYWORDS:kbnetwork kbbug3.51 kbbug4.00 kbfile

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The information in this article applies to:

 - Microsoft Windows NT Workstation versions 3.51 and 4.0
 - Microsoft Windows NT Server versions 3.51 and 4.0
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SYMPTOMS
========

When a client uses the telnet utility to connect to port 135 of a computer
running Windows NT Server, and then types more than 10 random characters
and disconnects, the server CPU usage jumps to 100 percent and does not
come back down until the server is restarted.

CAUSE
=====

This problem is caused by a problem with the remote procedure call (RPC)
components in Windows NT.

RESOLUTION
==========

To resolve this problem, download and install the appropriate file:

Windows NT 3.51
---------------

This hotfix has been posted to the following Internet location:

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT351/
   hotfixes-postSP5/rpc-fix

Windows NT 4.0
--------------

This hotfix has been posted to the following Internet location:

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/
   hotfixes-postSP2/rpc-fix

STATUS
======

Microsoft has confirmed this to be a problem in Windows NT version 3.51 and
4.0. A supported fix is now available, but is not fully regression-tested
and should be applied only to systems experiencing this specific problem.
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.

KBCategory: kbnetwork kbbug3.51 kbbug4.00 kbfile
KBSubcategory: nttcp NTSrvWkst
Additional reference words: Telnet RPC crash hang max 3.51 4.00 prodnt

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