just to let you known
curl --interface 2001:470:b682:1:ffff:ffff:ffff:fffb https:/ /validate6.ntppool.dev/p/
curl: (60) SSL certificate problem: certificate has expired
More details here: https://curl.se/docs/sslcerts.html
curl failed to verify the legitimacy of the server and therefore could not
establish a secure connection to it. To learn more about this situation and
how to fix it, please visit the web page mentioned above.
i was able to validate the address with -k anyway