I have a couple of ZCM 10.1.1 install (linux server, mssql db).
Since 10.1.1 (maybe from 10.1), I've notice a delay when refreshing
devices of around 1min or 1min30secs before actually starting refreshing
the devices... The refresh itself is quite fast... In ZCC, I select one
or more devices, then ask for a refresh. It stays under the Assigned
state for 1min, then the machines actually starts refreshing.
I was thinking about dyndns here, but resolves works perfect both
ways... Before, with 10.0.3 and prior, the refresh was starting right
away (looking at the Z icon in the systray...)

normal ?