Full explenation here:
http://forums.bistudio.com/showthread.php?154963-Server-error-Player-without-identity-****
Short version:
My mission file works when hosted on a client / in the editor. But when a dedicated server hosts it the clients whom connect stay in the loading screen forever (before even getting into the lobby).
The server does not start the mission file because the first line in the mission init.sqf (diag_log "test") is never executed (not in the rpt).
The rpt is however full with this message:
Server error: Player without identity selenj (id 968343173)