Coop connection issue

Hello,

I’m experiencing some issues with co-op game : I can no longer connect in co-op with my friend, she can not join mine either, when she tries to join me in my game, a popup appears indicating: “Attempt to join the game” and nothing happens during 5 minutes.

This corresponds to when I changed my PC config a little over two weeks ago, before that, everything was working fine. My local server backup remained the same. I changed my motherboard and therefore my network card (maybe this is the cause).
My network card is: Intel Ethernet Controller I225-V
My motherboard is: MSI MAG Z590 Tomahawk Wifi

We are both using Windows 10 to the updated build 21H2. We also use a 2Gb/s fiber connection.

I have tried a lot of things already:

  • Disabling the firewall and antivirus
  • Port Forwarding (useless since my friend can join a game on another machine).
  • My network drivers are up to date
  • Running as administrator
  • Invitation via Steam, or via the ingame utility
  • Reinstalling the game
  • Launch with BattleEye and without (both sides)
  • Modification of the “Engine.ini” file
  • With and without mods
  • I specify that all my other network games (local or not) work
  • I tried both ethernet and wifi, same observation
  • I tried to join online servers, it works, only the coop doesn’t seem to work.
  • I also consulted the forums without success after having tested the solutions proposed by the community.

Before that, I never needed to test any of these solutions for it to work.

I don’t know if you can help me. Maybe you can identify the problem.

Thanks

Up ! No one has any idea ? I’ve seen other topics in recent weeks on this same topic, it seems that I’m not the only one concerned.