I solved this problem by forwarding these ports on my router to my ip:
https://help.ea.com/article/online-ports-for-battlefield-3Quote
My flatmate and i had the same issue, tired chageing ports and disabling UPNP, doing all that with no luck, kept reading forums and chaging alot of things, after a couple of hours no luck, i thort maybe if connected to wireless and he connected to cable that it might work. gave it a shot and it worked 🙂 , not sure if it had been suggested somewhere else, but it works for us.
man i just started having that exact issue with the latest update (china rising). Nothing changed in my router config. Whats the deal?
