The following two messages can be observed from the Agent Manager logs:
SYNCHRONIZATION CHECKS
Check time sync status from vmware tools command line by running:
Windows:
C:\Program Files\VMware\VMware Tools>VMwareToolboxCmd.exe timesync status
Also, the following Event Viewer, Event IDs will show ntp synchronization messages:
Event ID 37
Event ID 35
Event ID 47
Linux:
vmware-toolbox-cmd timesync status
WORKAROUND 1
Go to Administration │ Agents │ Agent Status
Locate the VMWare Performance Agent in question, then click on Edit Properties.
Click "Save", then click "Save" again, Deactivate and Activate the VMware Agent again.
Please wait for a day to see the changes.
OTHER CHECKS
1. Check your firewall setting to unblock NTP UDP port 123.
2. If running NTP through Windows and if having service "Windows Time" running, please run the following commands from command line to check the status:
w32tm /query /configuration (checks and shows the NTP configuration)
w32tm /query /source (shows the source of the time)
w32tm /query /status (shows the service status, use it to check whether the time is coming from the external NTP servers or the cmos clock)
w32tm /query /status/verbose