Getting "Could Not Connect To CoopNet" many times.

[Rero2301]

I was about to join a server then the "Could Not Connect To CoopNet!" message pops up and when i tried it again it pops up again even the same thing when i host with coopnet,
i tried it 1 day later and its still there like i cannot join a server forever

Edit: i can only play on direct connection

 

[JellyCreamJam]

I was going to start playing today (hosting by myself,) and repeatedly got this problem too. Which makes it seem like it's not isolated.

EDIT: Tried again after posting this comment, and it seems to work fine again.