Run it in screen:
screen -AdmS eco mono /path-to-exe/EcoServer.exe -nogui.
I got another problem. In the first post it says mono version 5.4+ but atm mono only released 5.14?!
Can someone help me there?
Edit: Ah I get it. 0.4 is lower than 0.14. Even if that numbering is a bit odd.
Still I cant run a server.
It just quits at 100% without an error.
Running Debian Stretch.