Found out today, that the registrar that I use Only Domains’s AU front door is DOWN. That is https://onlydomains.com.au

$ host -t A onlydomains.com.au
onlydomains.com.au has address 198.50.252.65

$ curl -v https://onlydomains.com.au/
*   Trying 198.50.252.65:443...
* connect to 198.50.252.65 port 443 failed: Connection refused
* Failed to connect to onlydomains.com.au port 443 after 222 ms: Couldn't connect to server
* Closing connection
curl: (7) Failed to connect to onlydomains.com.au port 443 after 222 ms: Couldn't connect to server