ConfigMgr Clients Inactive in System Center Configuration Manager (Current Branch) Posted September 2 · Report reply Hi! In my environment (5000 clients) we had the same problem. Turned out it's how SCCM checks the clients' 'life indicators' that was the source of the problem. We use XDR antivirus, and have endpoint protection turned off. Endpoint protection being installed and switched on is one of the life indicators SCCM rely on to tell if a client is active/inactive. When I turned off Endpoint Protection in the client policy, the clients started to behave normally again. Took some time, a few months, but now everything is back to normal.