KNMFT

2 SOLUTIONS: 1) Bliz_23 solution worked for me. 2) Switch to Telstra Mobile instead of Telstra NBN (unplug your NBN cable). I have been unable to login on Telstra home NBN for a few weeks now. If I unplug the NBN cable, my Telstra Gateway switches to Telstra Mobile, and that works - I can login. But Bliz_23 solution also works, changing your DNS. I am surprised that Google DNS 8.8.8.8 does not work, I have been using that for many years, I never use the ISP DNS. And I never use my router as the DNS, because router DNS often fails and can be subject to Man In The Middle attacks.