I got the email from CAMK:

"We need to switch off the whole CAMK computer network on Friday,
3rd September, 16:00 for major maintenance. We will do our best to turn it back
on as soon as possible, but in the worst case scenario the break may last until
Monday, 6th September, 8:00."

So, from about 3pm CET our servers will be switched off until network comes back.

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