Any time I boot up a server I have this same issue, every single time.
Boot up a server without caves, it works utterly fine, no issues at all and everyone has a good time.
Boot up a server with caves on, and suddenly the srever isn't responding and no one can join.
I've tried this with AND without mods. It seems to make no difference.
Now I'm not sure if this is some issue to do with a firewall or what but this has been happening for a while and I really have no darn idea how to fix the issue or even what the issue is.
If you need any other info or anything let me know.
Host a server with Caves on Find your friends cannot join This is probably only my computer