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Microsoft KB Archive/171922

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Knowledge Base

Article ID: 171922

Article Last Modified on 11/1/2006


  • Microsoft Windows NT Workstation 4.0 Developer Edition
  • Microsoft Windows NT Server 4.0 Standard Edition

This article was previously published under Q171922


You may experience slow connections and performance or even loss of connectivity on your local area network (LAN) after you have made a Point-to-Point Tunneling Protocol (PPTP) connection to a Windows PPTP server.


Windows PPTP clients add an incorrect local subnet route to their route tables when they connect to a PPTP server that is using the same IP network ID.

For example, the client and the server are both on LAN subnets of a class B address such as, using a subnet mask. The server is on the subnet and the client is on the subnet. When the client connects through PPTP, it adds a route to the network with a gateway of the PPTP server to its route table, which increases the time it takes to locate LAN resources.

NOTE: If the PPTP server has no route to the PPTP client's subnet, the client will not be able to connect to its local subnet.


To work around this issue, use the following steps:

  1. Disable Use Default Gateway on Remote Network for the phone book entry that you use to dial the PPTP server.

    NOTE: If Use Default Gateway on Remote Network is not checked, the bad local subnet route is not added.
  2. Delete the existing default gateway (if one exists) by typing the following at a command prompt:

    Route delete

  3. Dial your PPTP phone book entry to make the connection to your PPTP server.
  4. Add a new default gateway to the PPTP network by typing the following at a command prompt:

    Route add mask X.X.X.X

    Where X.X.X.X is your client's IP address assigned by the PPTP server.
  5. After you disconnect, re-add your local default gateway by typing the following command at a command prompt:

    Route add mask Y.Y.Y.Y

    Where Y.Y.Y.Y is the IP address of the default gateway, or router, on your LAN.


Microsoft has confirmed that this is a problem in the Microsoft products that are listed at the beginning of this article. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.


For additional information, click the following article number to view the article in the Microsoft Knowledge Base:

254231 Change in Remote Access Route Behavior with Windows 2000

Additional query words: steelhead

Keywords: kbbug kbnetwork KB171922