Using the Privatetunnel (
www.privatetunnel.com) service over OpenVPN, I just found that (at least) following ports are open: 22 (SSH), 53 (DNS) and 443 (HTTPS). I'm just wondering, why the port 22 is necessary to be open. I thought that OpenVPN only needs the port 443 for a secure connection. Does anybody know, what for the port 22 is used in Privatetunnel?
