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Attendant Console could not connect to server after upgrade

sdavids5670
Level 2
Level 2

All,

I upgraded a BE CUCM/Unity Connection server from 6.1.2.1000-13 to 6.1.4.2190-3 and after the upgrade, the AC client software could not connect to the CUCM server.  After checking all of the obvious things and rebooting the computer on which AC client was running, I finally figured out a workaround.  The CUCM server was configured with a host name of UCM1 and a domain of localdomain.  The AC clients were pointing to UCM1.  If I added a record in the client's hosts file (%WINDIR%\SYSTEM32\DRIVERS\ETC\hosts) which pointed UCM1.localdomain to the IP address of the CUCM server and then pointed the AC client to UCM1.localdomain, everything worked great.  I'm just wondering why this happened.  The client must pass the name of the server in the payload (rather than simply using the name to resolve to an IP address).  So why, all of a sudden, does the server care about the FQDN?  Just curious if anybody knows or has run into this same issue.

Regards,

Steven

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