After installation or upgrade of the Endpoint Protection client to version 14.2 RU1 and newer, the Windows Security Center displays a substatus for "Virus & threat protection" and "Firewall & network protection" pillars to "Status unavailable, open Symantec Endpoint Protection for information". Additionally there is no expected green checkmark.
This issue is under investigation
Symantec is aware of this issue and will update this document when a solution becomes available. It is not necessary to log a support case on this issue. Please subscribe to this article to be notified of any updates.