You can create multiple SSL/HTTPS reverse proxy sites on one port.
Resolution
Prerequisites:
Each service has a unique IP address
Each service has a unique reverse proxy service
To create multiple SSL/HTTPS reverse proxy sites on one port:
Create a unique keyring/certificate for each of the reverse proxy sites. The hostname/common name(CN) must match the fully qualified domain name (FQDN) of the site.
(If applicable) If you have to create a Certificate Signing Request (CSR).
Create a unique reverse proxy service for each site. Note: Each service must be configured with a unique IP address and unique keyring.
Create policy to allow access to the reverse proxy URL on the ProxySG.