[Mark™]

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Originally Posted by ikey07 I already tried to change different ports, doesn't help, for testing even setup 0.3e server, same result.

Maybe all UDP based communication is firewalled. Turn off the VPN and try with your home connection, if you're successful then it clearly implies that your VPN has blocked UDP protocol, if this turns out to be the situation, contact them. VPNs usually block UDP protocol to avoid misuse of their service for DoS/DDoS attacks and those type of activities and the reason you're about to browse websites and forums without any issue is because websites/forums transfer data via TCP protocol which is never blocked and kept open.