I'm not gonna get involved here, can't imagine ever opening that many ports for anything, but I will say whenever you see the "Apply Changes" button still, that means you didn't apply changes. Click it.
What is the game??? As if its call of duty then you won't be able to as the Xbox shared the 3074 port which the PC requires to connect. I have this issue with 2 x PC's I can not get a workaround you may be able to by removing the 3074 port to the Xbox as unlike PC it can run under 3075 as an alternative for the game but for some reason, this is not possible on PC I can find.port forward 3075 for the Xbox and 3074 for the PC. Also if you can find how I looked but cant figure it out block port 3074 to the Xbox this will force it to use the alternate port. You could also run the Xbox in DMZ but I have seen people having consoles work together. Edit: You can also tidy up the screen by adding multiple ports to the port alias. This way you can have one rule for all UDP and one rule for all TCP ports - like this PC Gaming ports UDP 3074,4379:4380,27000:27031,27036
You can not port the same port to multiple devices. So when one connects it will use the 3074 port and when the second connect it will not be able to use that port. As said I have read with COD (not sure the new MW2) but the old ones they have opened ports to 3075 and 3076 for a fallback if multiple systems. This is only enabled on consoles though not for PC so the PC has to use the 3074. Why I suggest trying to block it on the Xbox so if it connects first it rejects the port. It would be worth a try and I am interested in your result. You could also try UPNP which I am playing with now but it is not creating any rules for my PC when using COD. If I start deluge it will create a rule for that so its not the PC seem the game has issues opening the port?? If you use UPNP i would port forward the PC and run the Xbox on UPNP. Tick default deny rule then set user specific permission. like this. Changing the 192.168.0.0 to your Xbox static IP address. allow 500-4500 192.168.0.0/24 500-4500 Deny 3074 192.168.0.0/24 3074also remove all forwarding rules for the Xbox as they will interfer