VPN issue with passthru driver on Windows 8 RRS feed

  • Question

  • Hi,

    I've tested passthru sample driver on Windows 8 and I have a problem with VPN connections.

    More exactly  I've installed passthru.sys driver and then I've created a VPN client. As long as the client is disconnected everything seems to work ok.

    When I connect the VPN client all external traffic seems to be blocked. Only the traffic with VPN server seems to work.

    Do you know what might be the problem?

    Thank you,


    Tuesday, November 20, 2012 3:53 PM


  • Hi,

    Passthru sample driver is NDIS 5.x driver and it is deprecated already in Windows Vista. Upgrade to NDIS6 filter driver or Windows Filtering Platform (WFP) driver and if there are still isssues ask again.

    Quote from Driver Compatibility for Windows Vista

    "NDIS 4.0 and 5.x intermediate filter drivers install and run in Windows Vista, but they are deprecated.
    Solution: Rewrite intermediate filter drivers as NDIS 6.0 filter drivers."

    BR, Antti

    Wednesday, November 21, 2012 6:42 AM