For example, I try to connect to VPN from dotvpn, and after connecting, no site opens!
Is there a special reason in Hetzner’s server?
If the VPN actually connects and establishes handshakes then after that, anything hetzner should be removed from the equation, yes?
If Hetzner was to blame, by for example blocking VPN traffic, that would stop the connection from happening in the first place, yes?
Probably misconfigured.