I don’t have any firewalls, and https://206.x.x.x and the internal IP one both worked.

It does. I think my subdomain is being blocked by ISPs.

I’ve done further testing with external network connections. I’m getting a Blocked hosts error, it seems my subdomain is being targeted by ISPs.

I get a 206 address that matches my server’s public IP. My laptop is on the same network as the portfolio, but I did test external connections using a mobile hotspot, which resulted in me successfully connecting to the IP address with telnet, but not being able to connect to the domain name. On my phone’s browser, while on data, I was able to access my portfolio website using the public IP address as the URL, rather than the domain name.

I don’t think it is, but its hard to tell for sure.

Yeah the DNS’ public IP matches my server’s. The access logs have some connections from the SSL validation and from when I successfully connected using the public IP address. The error logs are empty.

Yes, that’s what I did.

I can’t connect to the domain at all. I think the certificate problem was because I was connecting with the IP address rather than the domain name.

I get ERR_CONNECTION_TIMED_OUT when trying to connect to it. I don’t get any error logs on the server itself. I also got an ERROR_CONNECTION_REFUSED earlier.