I have a server, still live, which has VSE 8.8 DAT 8121 and hasn't updated since 310316.
It has a deployed agent handler its location which it can see this and has contact.
There are no entries in the mcsript.log after this date.
It responds to a ping and I can see agent events from the ePO console.
I have forced another agent successfully.
When I try to manually update the DAT I get these messages from the McAfee Agent Error Log
2016-05-18 05:39:03.506 I #2828 LstnSvr CAsyncSocket:oAccept for event: FD_ACCEPT
2016-05-18 05:39:03.807 I #2884 LstnSvr 'GET' request received from Host: x.x.x.x:58479
2016-05-18 05:39:03.807 I #2884 LstnSvr Cycle not detected. The request is from agent
In the agent event logs I see the message:
Agent is connecting to ePO server
No package received from ePO Server
Agent communication session closed