Hi everyone–
We have the following setup and issues. Users connecting to our office network using the Sophos VPN app over SSL VPN connect to machines present in our office network using Windows Remote Desktop. This does work well most of the time, but in an 8-hour interval each user experiences about 5 to 10 situations where the remote desktop connection freezes. Only way to revive the connection is by closing the remote desktop session and reconnecting. Stopping and starting the VPN connection again is not needed.
We followed the following guides to resolve the issue, but to no avail:
Applied set advanced-firewall udp-timeout-stream 150 and set vpn conn-remove-tunnel-up disable after google search (see Ref. \[1\]). It might also be a DoS block performed by the firewall which will require a DoS Bypass rule for RDP (see Ref \[2\]).
The previous change did not resolve all issues. A DoS bypass rule could help with this problem (see Ref. \[3\]). The rule is created using the guide line Ref. \[4\]
- https://community.sophos.com/kb/en-us/127785
- https://community.sophos.com/products/xg-firewall/f/intrusion-prevention/109828/xg-firewall---windows-remote-desktop-freezing
- https://community.sophos.com/products/xg-firewall/f/intrusion-prevention/109828/xg-firewall---windows-remote-desktop-freezing
- https://community.sophos.com/kb/en-us/123175
Further, we set the firewall rules for the incoming VPN to Intrusion prevention: None, Web policy: Allow all, Application Control: Allow All
How can we further debug the situation? If we remove the firewall and use a different VPN Solution (Synology) the problem does not happen.
Kind regards
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