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Error Message when installing patches on the client (0x800b0109)

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This error message appears on the client in the log "C:\Windows\CCM\Logs\WUAHandler.log"

Failed to download updates to the WUAgent datastore. Error = 0x800b0109

The reason for this is a self-signed certificate which was stored in the configuration of the patch catalog for SCCM. The following steps must be completed on the target machine for an installation of a 3rd party patch to succeed:

1. The self-signed certificate must be installed on the local machine under "Trusted Root Certification Authories" and "Trusted Publishers"

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2. In addition, a group policy must be activated on the local machine. Under Computer Configuration> Administrative Templates> Windows Components> Windows Update

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3. In addition, the registry can be checked on the local machine to see if the group policy works

Trustedpublisherregkey.PNG