You would like to configure the Authentication Connector as a SAML IDP that listens for SAML requests over HTTPS (port 443) instead of HTTP (port 80).
The Authentication Connector as a SAML IDP is limited to listening for SAML requests on port 80. Use one of the other supported SAML IDP solutions if HTTPS must be used for SAML requests in your environment.
Refer to our Access Methods WebGuide here for information on alternative SAML IDP solutions that support the use of HTTPS for SAML requests.