Having an issue on some of our sites and finding several other reports from the last 24 hours. Putting this out there to see if others are seeing it as well.
This means that your browser could not verify the site's SSL certificate with the issuer's OCSP server. It could be that the cert has been revoked, or the OCSP server is broken, or even that the CA changed the location of the OCSP server (Firefox permenantly caches the server's IP address to prevent certain types of attacks, so this is a pretty bad thing for the CA to do, but it does happen.)
