Service Pack 2 May Cause Loss of Connectivity in Remote Access [winnt]

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The information in this article applies to:

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

After installing 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
=====

In Service Pack 2, the Multilinking Protocol option (MP) is always 
negotiated during the LCP phase of negotiation regardless of whether 
the LCP Extensions checkbox under the Server tab in the phonebook 
entry is checked or not. 

MP is an extension of LCP, but is not part of RFC 1570 - LCP 
Extensions. It is no longer necessary to have this box checked to 
attempt MP negotiation. In NT 4.0 prior to Service Pack 2 this checkbox
needed to be turned on.

Some ISPs cannot deal with the MP options correctly. 

RESOLUTION
===========

If you do not intend to use the Multilinking feature, you can resolve 
the problem by turning off MP negotiation altogether. 

To resolve this issue, use Registry Editor (Regedt32.exe) to add the 
following values:

    Value name:  DisableMultilink
    Data type:   REG_DWORD
    Value:       1

to the following registry key:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RasMan\PPP

Stop and restart the RASMAN service.

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.

The change to the DLLs is that RAS will not attempt to try MP 
negotiation if there is only one link in the phonebook entry. 

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

Additional reference words: 4.00 sp2 prodnt