Troubleshooting: device not activating, engine off, silent devices

The three most common issues and their fixes.

1. 1Toggle ON but engine still 'pending': the device picks up protection on its next hourly check-in — give it an hour, then check the device is actually reporting (lastSeen on the Devices page).
2. 2RTP shows OFF on a Windows device in Active mode: something on the box is disabling Defender; the agent re-enables it hourly. If it keeps flipping, check for a third-party AV fighting it.
3. 3Device silent (no status in hours): check the agent service is running; on any platform the agent writes failures to agent-errors.log beside its config file — that file names the exact problem.
4. 4Isolation seems stuck: un-isolate from the portal and allow a minute; if the device lost its network entirely, isolation rules allow Cybermatic through — check the device can resolve DNS.
5. 5Still stuck? Open a ticket from Support with the device name — tickets are shared across all Cybermatic products.