I have installed and activated open SSL (letsencrypt.org R3 version V3) on my website. Website is working fine in Desktop browsers (Chrome, Firefox....) but in Google Chrome Android, I get security error. It seems not to be of previous cache because the error appeared today some days after installing SSL. Is there any issue with R2 and R3 SSL in Chrome mobile?


net err cert authority invalid

  • 5
    How old is your Android device? As of September 30th when the old Lets Encrypt root certificate expired, Android 7.1.1 and earlier don't trust Lets Encrypt certificates. techcrunch.com/2021/09/21/lets-encrypt-root-expiry Oct 11, 2021 at 8:54
  • Mine is Galaxy note 8. I have received Latest system update yesterday. But some iphone users also reported the same issue on our website. @StephenOstermiller Oct 11, 2021 at 10:55
  • en.wikipedia.org/wiki/Samsung_Galaxy_Note_8 says it came with 7.1.1 but system updates take it to 9.0, so maybe that isn't the problem. Especially if you are not having issues hitting other sites with Let's Encrypt certificates (including this one.) Oct 11, 2021 at 10:59
  • 2
    What is your website? Have you tried any tools to verify that your certificates are installed correctly? I've used ssllabs.com/ssltest in the past. Oct 11, 2021 at 11:00
  • 1
    I think that the new LetsEncrypt chain is signed by the old chain, so when you install the new LE chain, you end up with both. You should install the chain the LetsEncrypt gives you when you get new certificates and you should not install other chains. Oct 13, 2021 at 9:31


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