I'm playing with another person on the same network and it all works fine for the overworld. While I can enter and leave caves just fine, the client gets stuck on the "Connecting..." box when attempting to enter a cave. After a few seconds it'll report "Server is not responding." and then the client is sent back to the main menu.
I've tried disabling the windows firewall on both machines but it made no difference. Attaching the logs for master and caves from a short session where I just ran into a cave to trigger the issue. It says something about a bad Lua RPC call in the master log. Could it be caused by mods? I've got FinderMod, Global Pause, Global Position, Health Info and Wormhole Marks as active server mods.