Remote Desktop constantly reconnects when over OpenVPN

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Post by GregBrrr » Thu Aug 15, 2019 9:55 pm
I'm running Windows 10 1903, but this has been happening for years. I have a VPS hosted with in their CloudNX product. If I disable the firewall I can RDP to the box and everything is fine, but obviously I don't want that, so I've enabled the firewall and their VPN which is built on OpenVPN. I can connect and that's fine, and I can copy GBs of data back and forth uninterrupted, however, when on RDP over the VPN connection, the RDP client constantly black-screens and pops the "The connection has been lost" reconnecting dialog, which always reconnects on the first attempt within about 3-5 seconds. This happens on my home broadband (Virgin Media 220 Mbps down, 22 Mbps up), thathered over my phone (O2 4G, 50 Mbps down, 30 Mbps up) and on the connection at my office (Gamma Telecom 12 Mbps down, 8 Mbps up).

I asked Fasthosts and they had nothing useful to say. I've googled and can't see anything addressing the issue. There's nothing in the VPN log indicating the VPN is dropping.

Does anybody know a fix for this?


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Post by Eric » Fri Aug 16, 2019 12:23 pm
Hi Greg,

I'm afraid if the problem is not occurring with the firewall down, the firewall is most likely dropping or blocking the connection unintentionally after a period of time.

The only other possibility could be that your Internet connection may be dropping out, a short dropout could cause an RDP session to drop while the OpenVPN tunnel is unaffected, but this seems unlikely across multiple different connections.

The only thing we can recommend trying is dropping your MTU slightly. Try lowing it to 1450 first, then down in 50 increments and trying again. If you get to 1300 and the problem still occurs, I'm afraid going lower usually won't help. You can change your MTU by editing your connection and going to the Networking tab. Make sure you reconnect after you save the connection. For best results, change the MTU on the server to match and restart it as well.

Eric Thorpe
Viscosity Developer

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