Two different servers, you need to configure some proxy rules in your Apache of the main site.
Such HTTPS called inside a frame of another connection is normally forbidden.
You can read this section and you need to adapt the proxy rule for HTTPS.
Two different servers, you need to configure some proxy rules in your Apache of the main site.
Such HTTPS called inside a frame of another connection is normally forbidden.
You can read this section and you need to adapt the proxy rule for HTTPS.