There was a misconfiguration in the dnssec records. We are working on fixing it, but it also should be resolved as dns caches expire. I'll udpate if I have a better estimate of how long that will be. Most nameservers do not have this issue, and if you want an immediate fix, using 8.8.8.8, google's nameserver will probably fix it right away. Sorry about that.
-- Ian Kelling | Senior Systems Administrator, Free Software Foundation GPG Key: B125 F60B 7B28 7FF6 A2B7 DF8F 170A F0E2 9542 95DF https://fsf.org | https://gnu.org