Microsoft has just updated the following KB Article:

Configuration Manager clients become inactive and do not send inventory

Symptoms:
Microsoft System Center Configuration Manager clients that report to a particular server or subset of servers may repeatedly become inactive. You may also notice that the clients do not send inventory information for 30 days or more and that the data in the Inventoryagent.log file is static. Additionally, the ClientIDManagerStartup.log displays repeated occurrences of the following error:

[RegTask] – Client is not registered. Sending registration request for GUID:4874BD6C-CB98-4EEB-9F4F-721CC65B25C3 …
[RegTask] – Client is registered. Server assigned ClientID is GUID:4874BD6C-CB98-4EEB-9F4F-721CC65B25C3. Approval status 1
SetRegistrationState failed (0x80071770)
[RegTask] – Sleeping for 15360 seconds …

Note Error code 0x80071770 indicates that the specified file could not be encrypted.

https://support.microsoft.com/en-gb/kb/3067633

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