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The most common reason for this failure is that your ssl negotiations are failing. This can be caused by a lack of certificates on your system or your clock is out of tolerance for the ssl negotiations.

There's a lot of other questions related to this: https://www.google.com/search?q=website+may+be+down+rosdep

A few I found quickly are: https://github.com/ros/rosdistro/issues/9721 and https://answers.ros.org/question/316260/rosdep-init-cannot-download-default-sources/ Please try to look in to some of these other threads and edit your question with the outputs of the debugging that you do.