Self explenatory, me and my friend have been trying to play BO2 Plutonium for a few weeks now (installed from CB Launcher) but NOTHING WILL WORK. We have the same (msot up-to-date) game version. We can join other deticated servers but no matter what, whatever map we pick we cant seem to join eachother. The game errors the message above when joining with the friends list. I have portforwarded both my Ipv4 and ipv6 still nothing. Tried joining via ipv4 and ipv6 without port forwarding. Tried joining with and without the ":port" added to the end of both ip protocols. NOTHING. NOTHING. Tried Radmin VPN, still nothing. But it worked previously when we both had a FitGirl copy of the game. PS: Yes, firewall and defender are both disabled. No other Anti Cheat installed

]]>https://forum.plutonium.pw/topic/46094/error-unable-to-join-game-sessionRSS for NodeSat, 15 Aug 2026 14:04:36 GMTWed, 12 Aug 2026 09:12:24 GMT60You are not stupid, you obviously followed previous posts and did everything well. That is tricky. I was asking about Steam because I had the issue a few times. Could be interesting to have a third friend hosting ... I am happy to help to run some tests.

]]>https://forum.plutonium.pw/post/177199https://forum.plutonium.pw/post/177199Wed, 12 Aug 2026 23:44:59 GMTNope, neither me nor my friend. Even with Steam open same issue occurs, also in T4 (WaW)

]]>https://forum.plutonium.pw/post/177159https://forum.plutonium.pw/post/177159Wed, 12 Aug 2026 15:01:45 GMTDo you have Steam running on background ?

]]>https://forum.plutonium.pw/post/177149https://forum.plutonium.pw/post/177149Wed, 12 Aug 2026 09:41:34 GMT