VPN server is not configured to allow Generic Routing Encapsulatio

Discussion in 'Windows Vista Networking' started by Ana, Apr 2, 2008.

  1. Ana

    Ana Guest


    I am away from home and connected via a public wireless to the internet.
    (first time, I always connect from home). When trying to conect to internal
    server via IT connection manager, I get error 806:
    The VPN connection between your computer and the VPN server could not be
    completed. The most common cause for this failure is that at least one
    Internet device (for example, a firewall or a router) between your computer
    and the VPN server is not configured to allow Generic Routing Encapsulation
    (GRE) protocol packets. If the problem persists, contact your network
    administrator or Internet Service Provider. (Error 806) For customized
    troubleshooting information for this connection

    I could not find any usefull information on it manager help page.

    Does anybody know what do I have to do in order to be able to connect
    successfully? Thank you!!
    Ana, Apr 2, 2008
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  2. As it said, it is GRE issue. You need to make sure GRE port is open for pass
    through. Or this search result may help.

    ras error codeError 797 Error 781 Error 783 Error 800 Error 806 - the VPN
    connection ..... Error 806: a connection between your computer and the VPN
    server has been ...

    Bob Lin, MS-MVP, MCSE & CNE
    Networking, Internet, Routing, VPN Troubleshooting on
    How to Setup Windows, Network, VPN & Remote Access on
    Robert L. \(MS-MVP\), Apr 2, 2008
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  3. The PPTP VPN server your trying to connect to is probably behind a
    firewall/router that is not passing GRE Protocol 47 traffic.

    PPTP VPN needs both TCP Port 1723 open on the firewall/router and the device
    needs to be able to pass GRE Protocol 47 traffic. If its a consumer grade
    router that can sometimes be problematic. Some routers can be enabled by
    configuring for "PPTP Pass Through" or "VPN Pass Through" or automatically
    pass GRE Protocol 47 traffic if TCP Port 1723 is opened. Consult the owners
    manual for the router. Sometimes a firmware upgrade will fix the issue and
    sometimes not.

    If the PPTP VPN sever is behind a router on a corporate network contact the
    network administrators.

    You can test this by running the tests detailed in the "PPTP Ping" and "VPN
    Traffic" sections on this page.


    See the last part of this page for help getting the test software on your
    Vista PC.



    Al Jarvi (MS-MVP Windows – Desktop User Experience)

    Please post *ALL* questions and replies to the news group for the
    mutual benefit of all of us...
    The MS-MVP Program - http://mvp.support.microsoft.com
    This posting is provided "AS IS" with no warranties, and confers no
    How to ask a question
    Sooner Al [MVP], Apr 2, 2008
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