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Right. Somehow it only affects when the entry layer is IPv6 and protocol is OpenVPN with default tun-mtu 1500 as shipped by AirVPN. I have just tried now with Wireguard on same server, same device, same wi-fi network, and the problem is not happening. Same with OpenVPN entry layer IPv4 works fine. it's just OpenVPN with entry layer IPv6 and tun-mtu set to 1500 that causes it, if I manually switch mtu to 1280 when connecting via entry layer IPv6 (OpenVPN) problem is as well fixed. Too bad my carrier (mobile sim provider) does not offer IPv6 to try, I can only try from wi-fi.

OK, I was in contact with AirVPN support who were asking for the version of OpenVPN (it's 2.5.8 in DSM 7.2) and also for the OpenVPN log. I couldn't find it and, while googling the subject, came across a post by someone having similar problems with a different VPN provider. This worked for me: - Go to the config generator - Select Router - Don't click on Advanced, just select UDP 443 (I believe that's selected by default) - Select your server/country/whatever you like - Generate the ovpn file In DSM: - Create a VPN profile - Give it a name - Enter your AirVPN credentials - Select the ovpn file you just generated - Click the checkboxes in the next screen - Click Connect and it should connect... worked here anyway. This had been driving me nuts for a few hours. I even tried another VPN (free trial) which didn't work, so I was really wondering if the server's VPN module was broken!