Please take a look MikroTik RouterOS • View topic - Hotspots and SSL redirection to login
"There is the new HTTP status codes which include 511 "Authentication Required", and although the RFC itself mentions that currently, browsers will show a certificate error on an SSL page, I think browser vendors should be asked to not do that."
Maybe this is a way to go with CP and PAN?
We have a PA-5020 running 5.1.10 and do Captive portal internally and externally. In both cases we redirect http and https. Please check the following setting:
Please check the management profile and make sure you have selected https response pages.
The Captive portal settings should look something like this:
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