Why does my website no longer resolve after I enabled DNSSEC?
Remember that the digital signature you store in a DS (Delegation of Signing) record through the Domain Manager must match the digital signature that your domain name's nameservers produce. If it does not, by DNSSEC (Domain Name System Security Exentions) rules, the domain name cannot resolve to your website. Carefully review the DS record information you entered against the zone record stored on the nameserver and make sure they match.
See Managing DNSSEC for Your Domain Name for more information on viewing and updating your DS information.