SSL Issue on custom port

Cannot use SSL with custom ports, for example 9991, whereas on ports 443 and 80 its can

Hello, the custom port defaults to http
You need to add a new line to the site configuration for the port of https ssl

Is there an example of a new line configuration to add to an https SSL site?

zinedine_jidun

Refer to the configuration of 443 and add a new line of your port