Symptoms
Updates publish without issue but they fail to install on the client.
This error has been shown on C:\Windows\SysWOW64\CCM\Logs\WUAHandler.log
Failed to download updates to the WUAgent datastore. Error = 0x800b0109
Cause
Self signed certificates are not in the local computers Trusted Publishers and Trusted Root Certification Authorities store and you will need to enable Allow signed updates from an internet Microsoft update service location.
Solution
Import the WSUS self signed certificate to the client computer's Trusted Publishers and Trusted Root Certification Authorities and to change this setting in GPO.
Create a GPO which will import this certificate and enable Allow signed updates from an internet Microsoft update service location.
Please refer to Page 39 of the Administrator Guide
Affected Product(s)
Shavlik Patch