NTP Time Sync
Currently all virtual appliances sync their time with the virtual host on boot, if this time is wrong then the time on the appliance would also be wrong. If this gap is too large then NTP will not try and sync the time causing authentication failures. The suggestion would be to allow the NTP sync tool to overwrite the inherited time or set the time. I think this could be done by using the -g trigger for the initial sync on boot. Returning afterwards to the standard options.
This has been raised by one of our major distributors (case #5352751)