Access Denied

I had a friend try to connect to my server using an exe file I sent over, and while it seemed to find it running over hamachi, we’re getting an “Access Denied” error message. I’ve definitely got my port forward working and it should be set up, but can’t seem to get it to work (actually set up port forwarding for us to play wasteland 3 using direct lan, so surprised this isn’t able to do so)