Modern Warfare 2 on PS3

I had a nightmare getting this set up. Everytime I tried to join someones party, I’d be booted.

I have Belkin router (F5D8233-4v3) and followed the MW2 guide on PortForward.com but was getting nowhere.

MW2 said my NAT was open (apparently good) and the PS3 said my NAT was a ‘type 2’ (also apparently good). So what gives?

The problem was resolved by disabling uPNP on my router and PS3. My PS3 now complains that I’m a ‘type 3’ NAT (boo-hiss!), but MW2 still says i’m ‘open’. Oh, and it works.

At this point, all I can think is that manually opening ports AND having uPNP on causes some sort of conflict — perhaps uPNP tries to grab the ports and sees they’re already allocated?

Anyway, I’m posting this in case someone stumbles across this page - -I’m hoping this also fixes my PS3 Pro Evo online play issues It does.