Windows .exe Friend cannot join server

[HalliganCP]

My friend has been trying to join my Hamachi direwolf server i made for me and a few friends but he keeps getting "Cannot reach server". Could it be connection? I need help.

 

[Tristam Izumi]

Have you prioritized your computer to use hamachi over your normal internet IP? I know I had a similar problem before I did that, but I don't remember exactly how it's done, and I know it's done differently on different Windows versions.