Xen Server - Guest machine halted / hanged on reboot

Source From: BLog.CripperZ.SG http://blog.cripperz.sg/2014/02/02/xen-server-guest-machine-halted-hanged-on-reboot/
Happened to me when i update Ubuntu kernel and did a reboot to the guest / vm. Basically it didnt start and was halted. Had no access using Xen Center, with the error message below.
…. xen Unix.Unix_error(63, “connect”, “”)
So basically log in into xen console /...
Xen Server - Guest machine halted / hanged on reboot
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