I've running a BE6000 and upgraded this some weeks ago from CUCM 10.5.2 to 11.01 and Expressway hasn't been rebootet after this migration and was working fine.
Now i'd to reboot the whole BE6000 and now i get the issue that expressway seems not to be able to contact the CUCM Server.
In the logfile i can see this error:
2015-10-05T20:51:10+02:00 management: Level="WARNING" Event="Unified Communications server configuration" Detail="Failed to communicate with server" Host="cucm01.internal.local" Reason="HTTP Error" Error="'HTTPError:599'" UTCTime="2015-10-05 18:51:10,799"
Through the webbrowser i've no issue to access the CUCM Server - so CallManager itself seems to be running normal.
Anybody had such issue before? Is that related to CUCM 11.01 with Expressway X8.5.1?