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You need to forward the right ports of course:
34747 - TCP (Thanks to Patrick and CurrPorts we know this port is important, too)
49632 - UDP (Thanks to Patrick and CurrPorts we know this port is important, too)
34697 - UDP (taken from multiplayer.ini)
34597 - UDP (taken from multiplayer.ini)
8766 - UDP (taken from multiplayer.ini)
27016 - UDP (taken from multiplayer.ini)
40001 - TCP (not sure if really needed, but doesn't hurt to forward them as well)
40002 - UDP (not sure if really needed, but doesn't hurt to forward them as well)
When you did this your friend should be able to join the server hosted by you.
Good luck.
Just to add to those last 2: My multiplayer wouldn't host at all until we had those last 2 ports forwarded.