Let's Encrypt certificate not trusted on Firefox
I just added the certificate in IIS 8 (Windows Server 2012) using letsencrypt-win-simple.V1.9.1 . There are no problems in Google Chrome but in Firefox the connection is not trusted.
I followed this tutorial : https://weblog.west-wind.com/posts/2016/feb/22/using-lets-encrypt-with-iis-on-windows#TheEasyWay:LetsEncrypt-Win-Simple .
Solution
The answer above helped me a lot in finding a solution.
I installed the certificate using Certify: https://certify.webprofusion.com/ and it worked.
Regarding the outdated protocols ... Download IIS Crypto: https://www.nartac.com/Products/IISCrypto
Click on Best Practices (it will automatically select the recommended protocols and ciphers) and Apply. Then restart your server and everything is fixed .
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