Hmm. Don't know about ninja and DayZ.
Bman and I are (sorta kinda) running an Arma3 Epoch server.
I haven't kept up with it since early August (harvest still underway) and Bman is in the midst of a move. I've noticed when I've been able to check on it, that the server has been crashing a lot lately. IP is on the Servers page if interested. http://ro50pc.net/src/servers.html