I just reinstalled Windows 7 on my gaming PC, and installed MW2. I then manually installed the 1.3.37a patch, and it starts now, but now I have another issue.
I can't join any matches, and it says "0/0 Total Players in Playlists, 0 Total Players Online". This has never happened to me before.
I know it can't be a problem with my network, as my brother right beside me is gaming online on AlterIWNet 1.3.37a just perfectly, and the game indicates that my NAT is open. Windows Firewall on my PC allows both iw4mp.exe and iw4mp.dat to access the Internet.
When I start the game, I do notice this in the console:
AddPortMapping(28960, 28960) failed
Successfully mapped external port 28961 to internal port 28960
Setting our NAT to Open
I wonder if the game failing to do the add port mapping thing is something about the problem I'm currently experiencing.
I've already restarted my PC once without the problem going away. I know there can't be an issue with my Windows 7 installation, as it's fresh.