Single Interface Win2003 VPN

Discussion in 'Windows Networking' started by Jason, Apr 7, 2004.

  1. Jason

    Jason Guest

    I am having trouble setting up Win2003 VPN using one
    interface. With 2 interfaces, everything works fine. I
    want to use my current router to do NAT, therefore I would
    want get the single interface VPN working. The client is
    able to communicate with the VPN server, (gets up to the
    point of "Verifying username and password").
    The "IPROUTERManager.log" tracing file shows an error
    adding route:

    Error adding route, Stack bit == 0
    ProcessDefaultRouteChanges: Not default route (public ip
    of the vpn client)

    Any idea how I can get this to work, or is there a
    documentation on how to set up a single interface MS2003

    Please cc responses to e-mail just in case I miss your

    Thanks in advance.

    Jason, Apr 7, 2004
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  2. Jason

    Jason Guest

    One more piece of information, with single interface set up, I am able to
    connect to the VPN server from the LAN using the server's internal IP. Just
    not from external host trying to connect to the public address.

    Jason, Apr 7, 2004
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  3. Hi Jason,

    This sounds like an issue with the Router not allowing Protocol 47 (GRE)
    thru to the server. I would confirm that the router is setup to allow this


    [This posting is provided AS IS
    with no warranties, and confers
    no rights.]
    Matthew [MSFT], Apr 8, 2004
  4. Jason

    Jason Guest

    Thanks Matthew. I actually placed a support call to MS (should have waited
    for your answer ^_^) It was a firewall issue. We did a packet capture and
    found that the Fortigate 400 was modifying the keycall ID. Contacted the
    Fortinet and confirmed that there is an issue with PPTP pass through for the
    current firmware.

    Thanks again.

    Jason, Apr 8, 2004
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