You have enabled SSL decryption on the proxy, but the SSL service on the SSL error page still displays a certificate error
This is a common error, as we often try to use the certificate used by the proxy in the Web console's SSL service.
However, the proxy certificate is a root certificate, so that the proxy can generate certificates on the fly for the visited sites.
It must be the same for the error page service.
You need to go to the certificate section to generate a website certificate with the proxy certificate.
Secondary Certificates
” tabNew server certificate
buttonSubject Alternative name
, it should be the hostname to your Web error page.