The site opens via mobile Internet but not via home due to https how so?

Question

Digital certificates

I just do not understand. The site opens for everyone I know.
But only one person, the owner of the site. From his home network, he cannot log into the site.
But distributing the Internet from the phone - everything works. MAGIC!!!
If you disable https, then everything works fine.

site itself: https://xbanking.co.uk/

Answer 1

This site owner, by any chance, does not host it at home? It is quite normal when, from inside the local network, you cannot access the external address into which local addresses are loaded.
If it does not work only when HTTPS is enabled, you need to diagnose from the spot what is happening at all.