The .gov top-level domain suffered a DNSSEC problem today and was unavailable to some internet users, according to reports.
According to mailing lists and the SANS Internet Storm Center, it appeared that .gov rolled one of its DNSSEC keys without telling the root zone about the update.
This meant that anyone whose DNS servers do strict DNSSEC validation — a relatively small number of networks — would have been unable to access .gov web sites, email and other resources.
As a matter of policy, all second-level .gov domains have to be DNSSEC-signed.
The problem was corrected quite quickly — looks like within an hour or two — but as SANS noted, caching issues may prolong the impact.
Both .gov and the root zone are managed by Verisign, which isn’t on the best of terms with the US government at the moment.