COOP Host Problem / Client freezes

[HBB*Hunger]

Hello guys, again I need your help, this time not regarding the editor, but COOP hosting. 

 

The Issue:

 

Everytime I host a COOP mission, the connecting clients game just freezes BEFORE the loading screen even appears. Only a "please wait" text shows up. 

Since I have all ports correctly forwarded, testet a fixed and dynamic IP, i'm completely running out of ideas. We are 9 pilots flying COOPs, but just two of us can host. This is extremely unsatisfying, especially if these two have no time. 

 

Do you have similar encounters or ideas for a solution?

 

 

Thank you for any Ideas, 

 

 

Hunger

 

My Network:

 

Router <- WIFI Extender -> Ethernet Cable -> PC

Router = FritzBox WLAN 7390