You seek information regarding Symantec Web Gateway (SWG) 5.2 compatibility with Windows NTP sources.
SWG5.2.0 is more particular about the reliability of time sources than previous SWG software versions.
In addition to configuring as before, the registry of the Windows server hosting the NTP server must also be changed.
Navigate to HKEY_LOCAL_MACHINE\SYSTEM\CurrentControlSet\Services\W32Time\Config:AnnounceFlags
By default, the AnnounceFlags DWORD value is set to a. Edit this value and change it to 5.
Failure to set this registry setting on the Windows server will result in a gradual increase in offset, culminating in an inability to synchronize time between the SWG appliance and the Windows server.
Title: Windows Time Service Tools and Settings: Windows Time Service