We've just been informed that ARTstor will be down this weekend:
"Please be advised, ARTstor will be performing temporary maintenance this Saturday evening, February 27th, into Sunday morning, February 28th, between the hours of 7:00 PM and 1:00 AM EST. During this time, service will be intermittently interrupted. We anticipate full service to return by 1:00 AM.
If you experience any severe delays, please notify ARTstor User Services at userservices@artstor.org."