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I have installed an ssl certificate with letsencrypt (actually, my provider has an automated workflow for this which I used).

As the title says: in Chrome (Chromium in Linux) it says that it is safe. In Firefox (also on Linux) it says that the connection is not secure.

I tried googling why that is but that didn't yield any results (or I am really bad at googling)

So my question is: Why?

Alb
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  • Did you install the whole LetsEncrypt chain, or just your end-entity certificate? Chrome (and Edge) look for missing CA certificates in the chain using the AIA extension, while Firefox doesn't use this facility. – garethTheRed Apr 13 '20 at 11:40
  • Run `echo "" | openssl s_client -showcerts -connect :443` and see if the server sends all the certs, or just one. – garethTheRed Apr 13 '20 at 11:47
  • Check your site with [ssllabs](https://www.ssllabs.com/ssltest/analyze.html) and you'll like see "chain issues" or similar. Fix this by sending all the chain certificates in the right order. – Steffen Ullrich Apr 13 '20 at 12:55
  • Thanks for all the help so far. I'll look into each hint. – Alb Apr 13 '20 at 13:05

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