So as a follow up to my post Adding a SSL Certificate to a Vykon AX Web Supervisor the way WorkPlace N4 web supervisors imports a certificate is slightly different. Mainly the key needs to be in a unencrypted RSA format which was tripping me up. So if you need to do this first read that prior post and then the only real change is for exporting out your key use this command:
openssl pkcs12 -in CertExport.pfx -nocerts -nodes -passin pass:YourPassword | openssl rsa -out key.pem
You will find the key will be exported and have a “RSA” tag in the headers now. Follow the same instructions from the other post to make your pem file (key, cert, intermediate, root) and it should import into a N4 supervisor just fine.