DOCUMENT:Q167038  22-APR-2002  [winnt]
TITLE   :RAS Clients Run Winsock and RPC Applications Slowly
PRODUCT :Microsoft Windows NT
PROD/VER:winnt:4.0
OPER/SYS:
KEYWORDS:kbnetwork kbWinNT400sp4fix kbAPI kbSDKPlatform kbWinsock kbGrpDSNet

======================================================================
-------------------------------------------------------------------------------
The information in this article applies to:

 - Microsoft Windows NT Server version 4.0 
 - Microsoft Routing and Remote Access Service Update for Windows NT Server version 4.0 
 - Microsoft Windows NT Server version 4.0, Terminal Server Edition 
-------------------------------------------------------------------------------


SYMPTOMS
========

Remote Access Server (RAS) clients experience delays when Winsock or RPC
applications attempt to connect to remote resources.


CAUSE
=====

The RAS Server or Routing and Remote Access Service (RRAS) Server has provided a
Domain Name Service (DNS) IP address to the client that is unreachable. This
causes Winsock and RPC applications (over TCP/IP) to fail DNS name lookups.

By default, RAS or RRAS Servers project any DNS IP addresses they are configured
with to RAS clients using TCP/IP. If the RAS or RRAS Server has a DNS IP address
that cannot be reached by the RAS client, the RAS client experiences delays
whenever an application attempts to query the DNS name servers. The RAS or RRAS
Server may be unreachable because the DNS server is not responding or because
the RAS or RRAS Server is multihomed and the DNS server is on a network not
accessible to the RAS client.


RESOLUTION
==========

Perform one of the following steps to resolve this problem:

Windows NT RAS Server
---------------------

To resolve this problem, obtain the latest service pack for Windows NT 4.0 or
Windows NT Server 4.0, Terminal Server Edition. For additional information,
please see the following article in the Microsoft Knowledge Base:

   Q152734 How to Obtain the Latest Windows NT 4.0 Service Pack


Windows NT RRAS Server
----------------------

Obtain the Routing & Remote Access Service Hotfix Update mentioned below.


STATUS
======

Microsoft has confirmed this to be a problem in Windows NT 4.0 and Windows NT
Server 4.0, Terminal Server Edition. This problem was first corrected in Windows
NT 4.0 Service Pack 4.0 and Windows NT Server 4.0, Terminal Server Edition
Service Pack 4.


Microsoft has confirmed this to be a problem in Routing and Remote Access Update
for Windows NT Server version 4.0. This problem was corrected in the Routing
& Remote Access Service Hotfix Update. You can obtain this update from
Microsoft's World Wide Web Site on the Internet at the following location:

   http://www.microsoft.com/ntserver/commserv/exec/feature/routing.asp

NOTE: Because the Microsoft Web site is constantly updated, the site address may
change without notice. If this occurs, link to the Microsoft home page at the
following address:

   http://www.microsoft.com/


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

Microsoft has added a new registry value to the RAS service that allows an
administrator the option of preventing all DNS IP addresses from being projected
to RAS clients.

WARNING: Using Registry Editor incorrectly can cause serious, system-wide
problems that may require you to reinstall Windows NT to correct them. Microsoft
cannot guarantee that any problems resulting from the use of Registry Editor can
be solved. Use this tool at your own risk.

To enable this feature to prevent the RAS or RRAS Server from sending DNS Server
IP address(es) to RAS clients, perform the following steps:

1. Run Registry Editor (Regedt32.exe).

2. Go to the following key in the registry:

   HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\RemoteAccess\ 
   Parameters\IP

3. On the Edit menu, click Add Value and use the following entry:

      Value Name: SuppressDNSNameServers
      Data Type:  REG_DWORD
      Value:      1 or 0 (default=0, value of 1 prevents RAS Server from
                  sending the DNS Server address(es) to RAS clients)

4. Exit the Registry Editor and restart the computer for the change to take
   effect.


Additional query words: slow delayed Exchange client socket application RPC Remote Procedure Call DNS RAS Access Service ntrouter rras

======================================================================
Keywords          : kbnetwork kbWinNT400sp4fix kbAPI kbSDKPlatform kbWinsock kbGrpDSNet 
Technology        : kbWinNTsearch kbWinNT400search kbWinNTSsearch kbWinNTS400search kbWinNTS400 kbNTTermServ400 kbNTTermServSearch kbAudDeveloper kbRRASNTSearch kbRRASNT400
Version           : winnt:4.0
Issue type        : kbbug
Solution Type     : kbfix

=============================================================================

THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS
PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND.  MICROSOFT DISCLAIMS
ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES
OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.  IN NO
EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR
ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL,
CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF
MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE
POSSIBILITY OF SUCH DAMAGES.  SOME STATES DO NOT ALLOW THE EXCLUSION
OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES
SO THE FOREGOING LIMITATION MAY NOT APPLY.

Copyright Microsoft Corporation 2002.