All other HTTPS sites I’ve tried are behaving normally, incuding https://jwt.io/ It only occurs on https://[my_account].eu.auth0.com and the first time I encountered it was today. For months it’s been working perfectly.
Here is the output from nslookup:
$ nslookup [my_account].eu.auth0.com
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
Name: [my_account].eu.auth0.com
Address: 52.59.97.214
Name: [my_account].eu.auth0.com
Address: 54.93.108.42