STAS users randomly disconnecting

Question

STAS users keep disconnecting and have done since I purchased the 2 XG230 units. I've had a support ticket open since Feb 2018. 
 All tests in STAS (WMI, Reg, Agent, Collector) show as successful. 
 Live users appear in STAS and then randomly drop off, anywhere between 4min-4hrs. 
 Recently added another domain controller running the Sophos STAS agent. Any clients authenticated against that DC, in 'Show Live Users', display the XG's ip address?! 
 Then, suddenly appear again (twice) with the correct IP address and then drop off. 
 Any advise would be greatly appreciated. 
 Cheers

Tam Ben-Jusu · Answer

I believe, with the advice from Sachin and Aditya, the problem is solved. 
 1. It was a combination of the NTP server not being set correctly (by the Sophos expert who initially setup the XG!) 
 2. One of the domain controllers not being in a server group (on the XG) with a rule applied to stop ip address 'masquerading'. 
 This resulted in the Kerberos Event 4768 on the dc showing the user with the IP address of the XG! 
 I will monitor the situation and many thanks again.

sachingurung · Answer

Hi Mathew, 
 Did you upgrade to the latest STAS software version as I suggested you via DM? If the update didn't resolve the issue, you may raise a case with our support and provide the details. 
 Thanks,

Jelle · Answer

Directly from XG firewall with new firmware... Found it on my own.