Update (6:30 am, PDT): All of the planned work for this evening is now complete.
We unexpectedly had to reboot all of our webservers (at once) during the work tonight. This caused the "Forbidden" and "404" errors. Also, some late text messages and emails were sent as the result of some of the older webservers cleaning out their mail caches upon reboot. (Our webservers all netboot, and typically run on the same configurations, but one of them had been up for long enough that it wasn't using new mail relay information until it rebooted tonight) This was not intended and we do apologize for the inconvenience.