since the Arma 3 update 1.66 for dedicated servers you cannot start your server with some missions (especially altis).
The reason is, that the addon a3_characters_f cannot loaded in. But the addon pack (characters_f.pbo) exist in the addons folder.
So the rpt log shows me following message:
>18:51:59 Warning Message: You cannot play/edit this mission; it is dependent on downloadable content that has been deleted.
So the server tries to load in the mission, but it doesn't found the addon pack. Accordingly the server tries endless to load the mission, but witout success.