First, verify and be sure that your current CA Certificate’s Signature Algorithm is SHA1:
# openssl x509 -in /var/lib/CAM/YaST_Default_CA/cacert.pem -text
You will have to see a line like this: “Signature Algorithm: sha1”
To change it to SHA256, edit the following file with the editor of your preference:
Inside the file you will find multiple times the following configuration option:
Change all the above lines for:
Once finished, save the file and exit the editor.
And finally, you will have to delete the old CA certificate and create a new one with SHA256, by following all the steps of this TID:
NOTE: Do not deviate from the steps of the TID, follow it by the letter, using all the names for the Certificates and the SMT FQDN as described in it.
And again, because you are recreating the CA certificate, you will have to re-create the Server certificate too (as explained in the above TID) and also de-register and re-register all the Client systems to get the new certificates.