Overview
Easiest way to fix co-op if you got “Impossible to join the roam” message.
Co-op fix:
•If you can’t connect to a friend with an error “Impossible to join the roam”, just download RadminVPN[www.radmin-vpn.com].
•Radmin VPN is a new program for creating a local network (LAN) over the Internet, for a network game without restrictions on the number of players. The program works fast, similar to Hamachi, but it is free and without restrictions.
•You need to create a room in RadminVPN, and your friend needs to join it.
•Now your online game will work correctly.
•Easy as that 🙂
•P.S. Also make sure that both of you have turned off Windows Brandmauer and deleted Hamchi, Tunngle, etc.