Time synchronization is done by Kerberos and is very important, as Kerberos allows a time skew of less than 5 minutes for the time difference between client and server. If the time difference between the VDA and Controllers is too big (more than 5 minutes), there is a fair chance that the tickets will get timed out, causing communication to fail.

To troubleshoot this issue, you can make use of the W32tm utility or PowerShell. The following screenshot shows how to find the time difference between your controller and VDA machine by issuing a simple w32tm query:

Always make sure that the system time on all the systems is within a small margin and doesn't vary with a big difference considering the Kerberos skew.