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HTTPS to sites using LetsEncrypt certificates with MKR1000 fails #310

@kleag

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@kleag

I cannot connect to my RESTful API (Django REST framework) using https on my mkr 1000.

It worked beforehand on my local network.

I updated the firmware and was able to connect to google.com, arduino.cc or amazon.com using the WifiSSLClient sketch.

When I import my domain root certificate, there is no error message but the sketch cannot connect to my site. I tried also to connect (after importing the certificate) to the letsencrypt.org site (which probably uses also a letsencrypt certificate) and it fails also.

There is no error message at all, just if (client.connect(server, 443)) { returns false.

I had a look to this question on the Arduino forum and tried to apply the change on the ciphers handling that was proposed, with no luck.

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    type: imperfectionPerceived defect in any part of project

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