Is there any way you can get a console to the server? If not you may have to hook up some support from someone at the physical location or go there. Not a fun situation to be in; a lot of providers nowadays offer emergency network consoles for these sorts of cases.
If you're colocated and can add more physical equipment to your rack, I can say I've had good experiences using Cyclades gear for remote network serial consoles, so you may want to check them out.
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