First of All Make Sure You Don't Have

1. Viruses on Computer

2. Firewall blocking port

3. Himachi Adapter

 

1.)Open Your Router Settings (enter your Local IP:Port in Browser e.g - 192.169.1.1:80)

2.)Enter your UserName and Password (dafault password and username of router)

3.)Goto Port Forwarding Option

4.)Create a Port UDP 28960 in Your Router and Start mw3

5.)now if u still Have Problem Try opening UDP and TCP Both

 

if you still have problem I Refer Goto : http://portforward.com/

afaik NAT doesn't matter, as you're playing on dedicated servers. Also it's Hamachi and not himachi ._.

afaik NAT doesn't matter, as you're playing on dedicated servers. Also it's Hamachi and not himachi ._.

but its problem in mw2 really maybe also in mw3

afaik NAT doesn't matter, as you're playing on dedicated servers. Also it's Hamachi and not himachi ._.

but its problem in IW4 really maybe also in IW5

 

No, it's not ._. also this is a copy&paste from every other ''Open your NAT for codmw3 tutorial'' which you can find on Google. ._.

afaik NAT doesn't matter, as you're playing on dedicated servers. Also it's Hamachi and not himachi ._.

but its problem in IW4 really maybe also in IW5

 

No, it's not ._. also this is a copy&paste from every other ''Open your NAT for codmw3 tutorial'' which you can find on Google. ._.

no i wrote my selft

Even if you did, this is the same as any other ''open your nat'' tutorial on the web. Also it's pointless.