Client registration is pending

By | August 31, 2020

When reinstalling the ConfigMgr agent, the installation succeeds but the initialization does not. The machine is getting the same SMS GUID it had before although the SMSCFG.ini in c:\Windows was deleted and doesn’t show up in the ConfigMgr console. In MP_Registration.log you find these entries:

[RegTask] – Client is not registered. Sending registration request for [old GUID]
[RegTask] – Client registration is pending. Server assigned Client ID is GUID:[new GUID]
[RegTask] – Sleeping for 60 seconds.
[RegTask] – Client registration is pending. Sending confirmation request for GUID:[new GUID]
[RegTask] – Sleeping for 60 seconds.
[RegTask] – Client registration is pending. Sending confirmation request for GUID:[new GUID]

To resolve the issue, uninstall the client.

Delete the SMSCFG.ini in c:\windows and delete the machine certificates that you find in SMS\Certificates.

Reinstall the client and watch the MP_Registration.log

Mind that the registration may also be prevented if the ISRevoked flag is set for a particular GUID in ClientKeyData table. To check, run 

Select * from ClientKeyData where SMSID like ‘[GUID]’

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