Changes to api2.yubico.com

We have upgraded api2.yubico.com and its IP addresses has changed.

While you should never hardcode any of our IPs in your application or firewall, please do note the new addresses below.

New IPv4: 45.79.101.81
New IPv6: 2600:3c01::f03c:91ff:fe37:74ec

Old IPv4: 74.207.251.59
Old IPv6: 2600:3c01::f03c:91ff:fe96:45bc

If you must firewall your outgoing connections, you might be able to use DNS hostnames in your ruleset.

iptables and pf support this, but you must make sure to periodically reload your ruleset, otherwise changes to the DNS zones are not picked up.