How to play nolf1 in story mode co-op?

[MrNessuno]

We tried via Internet like we did in nolf2, and also in Lan mode with hamachi but the other one can't find the server. I did port forwarding. (We have the mod for story mode maps in coop.)

[Eliteone]

Windows 10?  make sure the port used for the server is open in the windows firewall. 

[xLite]

Got the same problem.
Did it help MrNessuno ?
Did you had any solution for it?