Hi there,
Thanks for your help. I realise that there was an 0x800b0109 error in the C:\Windows\WindowsUpdate.log on the client workstation. Then I added the HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AcceptTrustedPublisherCerts = 1 key into the registry and it works fine.
Thanks for your help. I realise that there was an 0x800b0109 error in the C:\Windows\WindowsUpdate.log on the client workstation. Then I added the HKEY_LOCAL_MACHINE\SOFTWARE\Policies\Microsoft\Windows\WindowsUpdate\AcceptTrustedPublisherCerts = 1 key into the registry and it works fine.