We are planning to perform a major hardware upgrade on Monday, July 25 (starting at 1:00 AM Pacific Time). It might take a few hours to complete.
Please note that until the upgrade is complete you won't be able to access Control panel and your digests won't be updated (still they will be served as usual).
This upgrade should help us to eliminate service outages caused by servers overload and dramatically decrease maintenance periods in the future.
Sorry for the inconvenience.