We will be applying a security update to our shared hosting servers today which will require each server to be rebooted. This will involve a short period of downtime while the patch is applied. This post will be updated when this is complete.
Update: Squid 12 has locked up while rebooting and we are working to bring it back up as soon as possible.
Update: As of 1:18 PDT Squid 12 is accessible again
Update: All server reboots are complete and changes have been implemented to reduce the reboot time on Squid 12.