Connection problem for a customer web portal

Hi everyone,

I have problem for one connection to a customer portal. If I try to connect to this website outside my organization I can connect, in my organization with a XG Firewall v.18.0.4 I cannot.

If I try to put my pc in a Firewall Rule that permitt to have all the connection without any restriction, I cannot connect.

I try to add this website in a Excpetion, but this doesn't work.

Can anyone tell me how I can check why this website is blocked on my XG Firewall?

Thanks