Re: Can't play BF4 Multiplayer (PC). At all.

From the post above.... Try this first:

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For Battlefield on PC, please enable the following online ports on your connection:

TCP: 80, 443, 9988, 20000-20100, 22990, 17502, 42127
UDP: 3659, 14000-14016, 22990-23006, 25200-25300

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Problem usually occurs due to the implementaion of NAT in your router.

You could also try putting your PC in the DMZ if your router supports it.