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We've got a new MacBook Air which has a new to us problem. It's unable to web browse to many common websites which normally auto-escalate from HTTP to HTTPS. Example, one can normally go to trello.com or pinterest.com just by that name in the browser and it'll auto bounce up to HTTPS. With this new machine it fails to connect. However, if you manually do https in the URL bar, it will connect.

Notably it doesn't affect all websites (google.com is fine, among others). It's also limited to this specific machine. Our old Macs don't exhibit the same behavior. OS X is fully up to date. I've even tested with Firefox and the problem happens there too, so it appears to be OS level (although, above ICMP level as pings work perfectly fine of course).

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Wondering if this might be related to instances where some http sites were being redirected to non-existent https sites. Try the following:

  • Clear your browser cache in Safari
  • Close Safari
  • Delete ~/Library/Cookies/HSTS.plist
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We ended up having to reimage the machine with a fresh install of OS X.

Other quirky problems were also found (with wifi and connecting to servers). Could not get any of them resolved, so after many hours of work we went for an OS reload. The fresh OS install cured all the ills. Very odd, since the machine itself was new, so it's not like the OS had a lot of time to get corrupted...

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