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We are aware of ransomware attacks specifically targeting Jupyter servers.First off: we have no evidence of a vulnerability in Jupyter associated with the attack. The attacks appear to focus on Jupyter servers with authentication disabled. That’s what this post is about: please don’t do that!Jupyter servers are authenticated with a random token by default, so you should be fine with the defaults. That default random token is regenerated on each server launch. If that random token is inconvenient...