My friend is having the same issue. I gave him the info (IP/PW) and still comes up with failed connect. He did a fresh install of the game, drives are updated, did verity cache, etc. There is no incompatible version, but definitely failed to connect. He'll go to a friend's server and no issue.

I've talked to the hosting company and everything looks fine on their end. I cannot figure out why it basically not allowing him to join.