My friend and I bought (through steam) Silent Hunter 4 a couple of days a go.

We played a number of multiplayer games (internet, not lan) just fine. No problems.

Today we decided to buy the expansion as well (also through steam). Game runs fine, but when I (or he) makes a server, he (or I) cannot join.

Server is not visible. No error message, no nothing.

I'm pretty sure it's not my firewall, router or whatever since we both played a few network games like 2 hours ago.

Now, with the expansion, it's dead?

What's the deal UBI?