Recently had an issue with a ESXi 5 host syncing. The host was in production for a few weeks. We had NTP configured to point to a Windows domain controller.
Yesterday we were not able to start RDP sessions to any of the Windows guests running on the host using domain user accounts. We noticed a time variation between
the domain controller and ESX host. Although the ESX NTP service displayed as running the time was off by several minutes. We restarted NTP and were again able to
do RDP's to the guests. We have the domain controller and 127.127.1.0 in the NTP server list. Can we add another NTP server to the list ? What order of NTP servers
does the host NTP service use ? Guest VMTools is configured to not sync guest time with the host. Thanks.