The problem mentioned by Dimitry Fabrje only arises when one tries to access https://www.hibernate.org. But then, that URL was never valid as far as I can tell, since there was never any certificate on this server.

So there is definitely a problem, but it's not new, so I doubt it's related to this ticket. I'll look into fixing this, but I'd advise you to still look for problematic caches on your side, because I don't think solving this will solve your problem.