I'm not quite sure what you are asking.
All I can say for sure is that although you login via https://domain-name.tld:8443
, when you click on the Web Presence Builder link, a new page opens and there's some sort of redirection in action.
The address bar initially says https://domain-name.tld:8443/smb/something-or-other
but then almost instantly changes to http://IP-ADDRESS:8880/sitebuilder/something-or-other
Note how we go from domain-name.tld to ip-address in the url (as well as going from https to http and 8443 to 8880).
At that point we get content in the page -- HTML, style and so on. We are not totally blocked. But whatever is running there can't communicate with "sitebuilder server" and throws an error.
The firewall redirect only affects non-localhost. And localhost has access to 8443 and 8880. So the redirect looks OK and not to blame? Maybe something that tortixd is (normally correctly) stopping from happening?