Martinelly: I tried to play with my son in a LAN. Regardless of who hosts the game, the other one gets:
you have been kicked from the server by the host Any idea what could have caused this? This applies also to Van Helsing III.
I know this is a bit late, but in case it helps anyone else - I had the exact same issue, and here is how I got it working:
The problem: This was caused by my partner and I both being logged into the same GOG Galaxy account on each of our computers, and - I'm guessing to make the "Friend list" feature work - the game uses Galaxy to lookup the user id, which then ended up being the same for the both of us. Using Cheat Engine to inspect the game, I could find `poacher2k` and my unique GOG ID (a long unique number) being in the game memory, and I also saw what looked like requests being made to GOG, so this theory seems pretty sound to me.
The solution: Either logout / uninstall galaxy on 1 of your computers (or more if you're playing 3-4 players), or go to `C:\ProgramData\GOG.com\Galaxy\redists` (your path might vary) and rename `GalaxyCommunication.exe` to something like `GalaxyCommunication2.exe`. The game won't be able to find the program, causing the user lookup to fail, and you'll be able to play just fine.
You might also need to end the "GalaxyCommunicationService (32-bit)" in Task Manager if it's already running.
Hope this helps!
Edit:
I don't think this matters, and I'm not sure what it's for, but you
can also change the `ProfileName 0` string in `regedit` at `HKEY_CURRENT_USER\Software\NeoCore Games\Van Helsing Final Cut\Options` to something other than `Offline`, which is the default. If you have Galaxy installed, you still probably need to do the above though.