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Depending on the settings you config, you may want to reverse those changes and test or do a reinstall.
Did you do a backup of a working configuration ini? If so, roll back to that. If not, a reinstall may be best.
OR did you install mods? if so, those will take a while to load. Remove them, save, then see if server restarts then.
You have done pretty much everything we would have suggested.
At this time you may contact Nitrado Support to further investigate.
Link: Support | nitrado.net
Thank you.
Click 'other'. Towards bottom it states "no solution found'. There you can create a ticket. 
Aaah, thanku 
