Hi, as Adobe Flash Player has been successfuly publish into your Wsus server, this mean that there is already a code signin certificate on the Wsus server.
The certificate of the root authority has to be distribute to client computers. Client computers has to be enable to trust 3rd party Publisher :
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AcceptTrustedPublisherCerts should be set to 1
There is a GPO for this.
The certificate of the root authority has to be distribute to client computers. Client computers has to be enable to trust 3rd party Publisher :
HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AcceptTrustedPublisherCerts should be set to 1
There is a GPO for this.
