Me and my friends cannot join each other due to udp port error 20595. I found the official manual page. Opened ports, turned off the firewall, antivirus, even tried hamachi, as well as the "STUN" checkbox when creating the server, nothing helps. Probably - this is due to the fact that I have a gray ip address? If so, it is worth mentioning in your official FAQ so that people do not waste time opening ports if it is useless.