I have a site with local subnet 192.168.1.0/24, with:
Windows machine 192.168.1.3
Linux machine running openvpn server 192.168.1.4
I am connecting from a remote site with local subnet 192.168.2.0/24
The VPN network is 10.8.0.0/24
I have the router on the server network 192.168.1 set up with a static route
10.8.0.0 -> 192.168.1.4 (VPN server)
I found this was required in order to get responses to pings from the client network to machines on the server network.
If I turn the Windows firewall off on the Windows machine on the VPN server network then I can RDP from a machine on the VPN client network (e.g. 192.168.2.23) to the Windows machine on the VPN server network no problem.
If I turn the Windows firewall on then the RDP login box appears and accepts my password but then hangs with a black screen before eventually saying:
"The connection to the remote computer was lost, possibly due to network connectivity problems"
I can't find what the Windows firewall is blocking. I have allow Remote desktop for private and public networks enabled in the firewall settings.
I used wireshark to monitor the traffic with and without the firewall enabled and it looked like UDP from the Windows machine was being blocked, so I enabled allow all incoming and outgoing traffic to the 10.8.0 network in the firewall but that didn't help.
One thing I've noticed is that if I disable the firewall then enable it again, RDP connections work for about half an hour (i.e. disconnect/reconnect), but then at some point stop working until I toggle the firewall again.
With the firewall on I can ping the Windows machine from the client network and telnet to port 3389, it is only after establishing a RDP session that whatever traffic is required for the session gets blocked and kills the session.
Windows RDP firewall issues over VPN
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- OpenVpn Newbie
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- OpenVpn Newbie
- Posts: 2
- Joined: Wed Mar 24, 2021 8:57 am
Re: Windows RDP firewall issues over VPN
It's not the firewall.
It does the same with the firewall off.
Something to do with RDP over VPN
It does the same with the firewall off.
Something to do with RDP over VPN
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- OpenVPN Protagonist
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- Joined: Fri Jun 03, 2016 1:17 pm
Re: Windows RDP firewall issues over VPN
The version of Remote Desktop which comes free with Windblows is known to be garbage ..