Gpu Grid is running, have 1 running now. What I think is happening, is a project goes down for maintenance or backups, they take the whole system offline, so not found, when one tries to connect during "Down time". Ive have that happen to alot of projects!
I guess their are a few project admins, that dont realize their is a "Maintenance Mode" in the Boinc server side of their project. They just have to start it up, instead of taking the whole friggin system down.