The guys at the Folding@Home project have been having some network issues lately. Here's the blurb from their news page:

It's been a rough week for FAH. There was an unplanned power outtage in the building housing our secondary server room. This outtage had an impact campus wide, including in our primary server room. This appears to have lead to a problem with the cooling in our primary server room and that's being dealt with. Also, we continue to have some issues with the network due to the switchover to the new network (Medical school vs Campus). Both of these issues are being actively worked on, but may take some time to finally resolve. FAH is up and working quite well all things considered and hopefully we'll get the last bits up later next week.