The [IRIS website](https://iris.eecs.berkeley.edu) was unreachable Dec 29th from around 2am until around 4pm. A change in configuration was made at 2am to put move all departmental websites behind a load-balancer. A misconfiguration in the balancer was preventing SSL connections from working.
The misconfiguration has been fixed and the site is functioning normally again. My apologies for the inconvenience.