The CAcert main webserver will be unavailable for about one hour on Wednesday November 23, 2011, starting at 10:00 UTC. A database update is scheduled to take place on that day between 10:00 UTC and 11:00 UTC. If you are interested in the technical details, please check https://bugs.cacert.org/view.php?id=976.
We expect that the update will be completed within one hour. During the update the website cannot be accessed, and no certificates can be issued or revoked. Other CAcert services (CRL, OCSP, mailing lists, wiki etc) will remain available as usual.