Its probably a security thing. In some routers, there are different types of NAT. I will have to test and see if I can get around it. Another option (while expensive) is to get a block of static ip addresses from your provider so that each person's computer has a different public ip address. This would definately work.
Look for something that pertains to NAT. It depends on the router, some call it strict nat, you want that disabled. On mine its "restrict forwarding rules to ip" and I have it turned off. The issue is that you want to make sure the traffic does not go to one pc or the other. This is why upnp has to be turned off. UPNP is actually setting up forwarding rules automatically to one machine or the other..You should not have to forward any ports to your machines, and if you do, the forwarding rules are taking all that inbound traffic and sending it to one machine. Also, dont DMZ just one machine, because you are in effect doing the same thing. Let me know if this gives you any clues. Tough to say without your router.
Yes, one of the previous posters was correct.
1. Log in to your home router and disable uPnP.
then, for both computers:
2. In Windows, Go to Start > Run and type in Services.msc
3. Stop the "UPnP Device Host" service.
4. Stop the "SSDP Discovery" service.
I'm a bit annoyed, 2 players used to work for the 1st week after the release. Then it started disconnecting as described.
EA didn't help at all. The community solved it.
And apparently the problem occurred in BF3 also. You think they'd have added this solution to their known problems page.
