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Modern Warfare 3 Strict Nat on PC (O2 Router)

Ornlu Wolfjarl

Standard Member
Hi, I have Modern Warfare 3 on PC and a few days ago the NAT went from Moderate to Strict. Now I can't host games with friends, and some of them live on university campuses, so I can't join them either since they have strict NATs as well but they can't access their routers.

I've tried a couple guides to open it, but nothing works (maybe because they are meant for Xbox360).

So far I have enabled UPnP from the router options, telnetted the router and tried to open the NAT from there, tried portforwarding and disabled my antivirus and Microsoft's firewalls to no avail.

My router is an O2 Thompson.

Any ideas?
 

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