Safari 15.4 on Monterey 12.3 cannot access certain websites
Using Safari Version 15.4 (17613.1.17.1.6). After the upgrade from Monterey 12.2 to 12.3 Safari cannot access certain websites on MacBook Pro (early 2015) and Mac mini (2018).
Note that I have no Safari extensions and no content blockers. I have deleted all History to see if that fixes it, but no.
For example, I can access bbc.com and nytimes.com everytime, but abc.net.au - my daily news read - can no longer be accessed. All I get is: "Safari can't open the page "www.abc.net.au/news/" because Safari can't connect to the server "www.abc.net.au"."
Website works just fine on Firefox.
Also, I cannot log into Official Apple Support Community with Safari. After clicking Login link, I get a page that's blank except for the Apple header.
MacBook Pro 13″, macOS 12.3