DOCUMENT:Q161368    [winnt]
TITLE   :Service Pack 2 May Cause Loss of Connectivity in Remote Access
PRODUCT :Microsoft Windows NT 
PROD/VER:4.00
OPER/SYS:WINDOWS
KEYWORDS:kbenv

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The information in this article applies to:

 - Microsoft Windows NT Server version 4.0 Service Pack 2
 - Microsoft Windows NT Workstation version 4.0 Service Pack 2
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SYMPTOMS
========

After you install Service Pack 2 for Windows NT 4.0, you may not be able to
ping or otherwise make use of the connection you have established with an
ISP when using RAS to dial out.

Additionally, the route table may not have a route for the remote
connection.

CAUSE
=====

The Multilinking Protocol (MP) option is always negotiated during the Link
Control Protocol (LCP)-phase of negotiation in Service Pack 2 for Windows
NT 4.0. This occurs if the Enable PPP LCP Extensions check box on the
Server tab of the Edit Phonebook Entry dialog box is enabled or disabled.

Although MP is an extension of LCP, it is not part of RFC 1570 -- LCP
Extensions. In Service Pack 2 for Windows NT 4.0, it is no longer necessary
to enable this check box to attempt MP negotiation.

NOTE: Some Internet service providers (ISP) cannot deal with the MP options
correctly. This problem is resolved by changing the conditions in which RAS
sends multilink information to the remote server.

RESOLUTION
==========

The binaries below resolve this issue by making an attempt at MP
negotiation only if there is more than one link in the phonebook entry.

STATUS
======

A supported fix is now available, but has not been 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.

NOTE: This fix is to be applied only to computers with Service Pack 2 for
Windows NT 4.0 installed.

This hotfix has been posted to the following Internet location:

   ftp://ftp.microsoft.com/bussys/winnt/winnt-public/fixes/usa/NT40/
   hotfixes-postsp2/ras-fix

MORE INFORMATION
================

For additional information, please see the following articles in the
Microsoft Knowledge Base:

   ARTICLE-ID: Q154917
   TITLE     : Cannot Access Internet with Dial-Up Networking and MSN
               Account

   ARTICLE-ID: Q135530
   TITLE     : Using Windows NT to Access The Microsoft Network

KBCategory: kbenv
KBSubcategory: NTSrvWkst ntprotocol
Additional reference words: 4.00 sp2 prodnt dun dial-up networking Bad IP
Address RAS

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