To ensure that your Artica proxy is corrently synchronized it is better to enable your Active Directory as NTP time server and then allow Artica to synchronize its time using Your Artica Directory as source clock server.
See “Time synchronization with Active Directory did not working properly”
Open a PowerShell console and type the following code:
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\Services\w32time\TimeProviders\NtpServer" -Name "Enabled" -Value 1
Set-ItemProperty -Path "HKLM:\SYSTEM\CurrentControlSet\services\W32Time\Config" -Name "AnnounceFlags" -Value 5
Restart-Service w32Time