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RDP does not work over UDP on port 443

Markus Steinbauer

Hi,

I have a Problem on our new sophos XG Firewall.

It seems that the Firewall is manipulating UDP Packets sent to an OpenVPN connection on Port 443 causing RDP to show a black screen all the Time and not getting the Desktop at all.

Does anybody have an Idea on how to solve that problem.

Current Setting:

PC from DMZ tries to connect via OpenVPN on UDP port 443 to the remote Gateway passing through the XG Firewall and succeeds with the connection.

Afterwards I try to open an RDP to a Server located in the Tunnel - I get the Logon WIndow and it does just show a black screen.

The Rule in the XG Firewall is allowing UDP Traffic on Port 443 to the remote gateway and does not have any Security Features (Webfilter, IPS, TLS Inspection, ...) enabled any more.

Best regards,

Makrus



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  • 0

    Mostly the RDP packets are too big.
    i would try to reduce the MTU


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

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  • 0

    Mostly the RDP packets are too big.
    i would try to reduce the MTU


    Dirk

    Systema Gesellschaft für angewandte Datentechnik mbH  // Sophos Platinum Partner
    Sophos Solution Partner since 2003
    If a post solves your question, click the 'Verify Answer' link at this post.

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