Saturday, October 24, 2015

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



Symptoms

Updates publish without issue but they fail to install on the client.
This error has been shown on C:\Windows\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 intranet 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 intranet 




To check this policy locally go to run and type in gpedit.msc
Then navigate to Computer Configuration > Windows Components > Windows Update












If the issue is still present add the following DWORD to the registry. 
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AcceptTrustedPublisherCerts
Modify and change the value to 1 in decimal.


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