More than 20 seconds later login dialog appears in Desktop Viewer window during session launch operation.
Launch session takes a long time, then login dialog appears. Session can be launched if provide proper certificate to login.
This issue often occurs on first launch session operation, rarely seen this behavior at reconnect session.

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Remove unexpected and duplicate DNS records on DNS Server. (something like following screenshot)
We can remove DNS Record from DNS Server=>DNS Manager=>Select a DNS record which you want to delete=>Click Delete to remove the DNS record.


 

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Problem Cause

DDC has completed Validation Request in a short time, but VDA has much delay when try to process the Validate Response from DDC.
Massive DNS Records lead to VDA validate response process take a long time.
As a result, session not launched as expected .