There will be a scheduled downtime this Friday (12/15) for cvs-mirror.mozilla.org at 22:00 PST. It's expected that the machine will be back up and running by 03:00 PST the following morning. This means that anonymous CVS will be down during that time. This server is hosted by Source Forge (http://sourceforge.net/) at VA Linux and is moving to their new Fremont facility.