Time difference between Veeam Monitor server and ESX host is too large.

To resolve the issue, consider the following:

Check Time Zone and NTP Settings

If the vCenter and Veeam ONE server are in the same time zone and should be expected to have the same time, review both servers' time zone and NTP settings to ensure their time is synchronized and matching.

Adjust Accepted Time Difference Settings

1. Stop the Veeam ONE Monitoring Service and Veeam ONE Reporting Service services.
2. Create the following registry value on the Veeam ONE server:
   
   Key Location: HKLM\Software\Veeam\Veeam ONE Monitor\Service\
   Value Name: MaxTimeDiff
   Value Type: DWORD (32-Bit) Value
   Default Value Data [Dec]: 900
   
   Note: Registry value is configured in seconds.
3. Adjust the MaxTimeDiff value to a value greater than the expected time difference.
   
   Example: 5 hours time difference = 300 minutes = 90000 seconds.
4. Restart the Veeam ONE Monitoring Service and Veeam ONE Reporting Service services.