PENDING Unknown client or has an invalid key registered in database.

[dana.corson]

I'm getting errors in the MP_RegistrationManager.log:
Client 'GUID:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxx' is unknown or has an invalid key registered in the database.
CCMValidateAuthHeaders failed (0x87d0025e) to validate headers for client 'GUID:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxx'
MP Reg: Failed to verify RegistrationHint, 0x87d0025e.

In SMS_MP_Control_Manager - this is coming up evry 10-15 min:

MP has rejected policy request from Client (SMSID = GUID:xxxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxxxx') because this SMSID is marked as blocked.
I've run several SQL queries to locate the GUID with no success.

The status of our MP is critical due to all these warnings.

Any help would be appreciated!

 

[Garth]

The error states you have blocked thus guid.. So did you approve the guid?

 

[dana.corson]

When I look at Certificates, I don't see the GUID. I think we have a device on the network attempting to register with SCCM, which was being blocked as it is not recognized as trusted.

 

[Garth]

if I remember right, within the logs you can see the devices name. I would go look for that device and try to reinstall the agent.

 

[dana.corson]

Which log would show the device name?