Sorry about the incident. Reason: We use a mix of cloud servers (aws, google), online providers and our own servers to load the site. One of our servers completely failed during the day - when you were hitting that particular server, the message was displayed.
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Old and aging hardware is to blame. Looks like it is time to replace some of these. :-(
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Really sorry for the inconvenience. We shall make sure it does not happen again. Thanks for your patience.