We have came across a issue in Readytech the Client console v8 is not loading with https:// however it works on http do find the error screenshot for reference.
It seems that the port 443 is being blocked by the firewall.
Other possibility, if Campaign isn't the only app on that server, check if no other app is using 443 - This wouldn't allow Campaign's http server (being apache or other) to start on 443.