Troubleshooting/Can't interact with server
From JC2-MP Documentation
- Chat messages don't show up
- Can't see other players
- Spawn in the sky near the broadcast tower in the north
- Buy menu, chat commands, and similar don't work
This is a known issue with no known workaround. Check your firewall to be sure it isn't blocking anything. You may also have problems with public connections such as at universities.
It seems to be caused by the client having no upload to the server. In one case, a server's overzealous DDoS protection was dropping packets from a few clients. However, there are people who have this problem with all servers.