Scenario:
The Controller failed in a XenDesktop Site. A Citrix Administrator was able to quickly bring it back
online. Immediately after bringing the Controller back online, another Citrix Administrator noticed
that many virtual machines were listed as Unregistered in Director. What is the probable reason
the machines were listed as Unregistered?
A.
The virtual machines were shutdown.
B.
The virtual machines were suspended.
C.
Windows Firewall is NOT properly configured.
D.
It can take up to 10 minutes for VDAs to reregister.
A – A VM shutdown would not cause VDAs to show as unregistered
B – same with a VM suspend
C – can’t be a firewall issue in this case because it happened only after the delivery controller was shut down. VDA uses TCP ports 80/1494/2598/8008/1494/2598
D – if the VDA was configured to point only to the delivery controller that failed, yes it can take some time to detect it as available again.
I would at first check the Citrix Broker service (try to restart it if it’s running) and then reboot the VDA if it is still showing unregistered.
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