Connection timeouts on random websites

[delion 0]

Hello,

unfortunately the Caelum Server (Austria) went down today, so I have to use either Alderamin or Beemim. But with those two I have the frequent problem that websites are unreachable because of timeouts. This problem though only exists within AirVPN usage, the website itself is fine and reachable via my WAN route or other VPNs.

I use AirVPN via WireGuard through my OpenWRT router. Just to be clear: the tunnel itself is fine, this also happened with multiple devices (this is the third OpenWRT router I use for this). This happens randomly, other websites are normally reachable and keep doing so, but a specific website not. The problem persists with this website for some time (usually a couple of days) , after this time passes it's somehow working. No changes made.

I tried to comprehend the issue, but it's extremely difficult to troubleshoot. It seems like it's a combination of a DNS and route problem within AirVPN, but this is just a guess of mine. Very strict firewall rules on the OpenWRT router (no LAN to WAN forwarding, default route via VPN, strict no-leak setup) seem to make things worse, but I could not isolate this. Nowadays I use a less strict policy-routing setup.

But this issue is very annoying. Together with more and more sites/services which block VPNs altogether, this problem makes AirVPN barely usable for me. I need a working server in Austria, and Alderamin/Beemim are not working so well for me.

I tried searching for this problem, but did not find anything useful. Anything helpful would be appreciated.

Edit: checking AirVPNs route tool, seems this time the site is not reachable from any server. So probably blocked. Maybe I jumped the gun too fast here, since the pattern was exactly the same as before. So take my description above with a grain of salt.

Current example sites: jump25.at and kinder-guide.at

Edited ... by delion
update

[go558a83nk 383]

I think this is likely an MTU issue.  You need to lower the MTU of your wireguard interface.