Has guides on exactly how to do it (and the exact ports to forward for BF4,) as the method to so differs depending on your router. I recommend using the port check tool that's there under "Free Software to test if your ports are forwarded" to test if port 443 is open.
Another thing to keep in mind is if you use Skype regularly, make sure you have "use port 80 and 443 as alternatives" unchecked. You can find this under tools>options>advanced>connections.
Here is another guide to check and see what programs are using which ports:
http://helpdeskgeek.com/windows-7/use-netstat-to-see-listening-ports-and-pid-in-windows/
(Of course, that guide applies to Windows 7 and may differ depending on which OS you are actually running.)
