Ok,
each time you change certificat, you need to resign already published packages.
Right-click on a package and choose resign. Ensure that the certificate that is currently in the 'Wsus' store in the certificat magazin is the one that is used by clients computer.
each time you change certificat, you need to resign already published packages.
Right-click on a package and choose resign. Ensure that the certificate that is currently in the 'Wsus' store in the certificat magazin is the one that is used by clients computer.