Friends cannot connect to my server "No response from remote host"

#1
I've port forwarded and tested to make sure the ports were open. I've tried hosting the server both by using the "BarotraumaServer.exe" and by hosting through the game itself. My router doesn't allow upnp so I don't use it, I've tried hosting both public and private. The only time a friend was capable of joining was when I hosted through the game with public off and upnp off but it only worked once and once they left they couldnt rejoin. I also cannot connect to my server myself if I use the server .exe

Any help appreciated, thanks!