I have AussieBB and had to give them a call at one point to allow inbound traffic so I could expose my self-hosted server. They flicked a switch for my account and then everything came good.

If you give them a ring and explain what you’re trying to do it should get sorted out very quickly. Their customer service staff are very knowledgeable and friendly - they’re the best RSP I’ve ever had.

Does the A record for your domain match what your IP is right now?

Did you update your public IP address for your domain after changing ISPs?

Acronyms, initialisms, abbreviations, contractions, and other phrases which expand to something larger, that I've seen in this thread:

3 acronyms in this thread; the most compressed thread commented on today has 7 acronyms.

[Thread #121 for this sub, first seen 9th Sep 2023, 08:45] [FAQ] [Full list] [Contact] [Source code]

Sounds to me like your IP changed and your A record isn't pointing to the proper IP anymore.

The new ISP would have given you a new IP address. Do you use a dynDNS to automatically update the record? Or do you need to manually update your domain's DNS service to point to the new IP address?

Does your new ISP allow 80 and 443? I was under the impression that's pretty rare for ISPs though I'm not sure that's true in Australia. Mine only allows 443 but not 80 "to prevent Internet worms from spreading and to protect bandwidth." 🙄

I'm on ABB and everything was fine after I called up and got CGNAT disabled and the ports unblocked.

You can unblock ports in the MyAussie phone app these days.

And you most definitely got a new IP address. Make sure you've updated your DNS. My IP hasn't changed in over a year. It only ever changed when they upgraded their equipment.

Did you check whether the new IP assigned are any different. Once it happened that my old ISP had ip range 192.168.0.x. but the new ISP had ip range of 192.168.1.x

This made my machine not accessible.