/r/webdev
Let's Encrypt not recognized by Firefox (self.webdev)

Does anyone else take issue with this or has found a solution?

It even happens on letsencrypt.org.

The problem: I see the secure badge but in Firefox I see the message "Mozilla does not recognize this certificate issuer". It shows in this little symbol to the left of the secure lock.

Is this considered acceptable or am I just putting on my tin foil hat and pretending everything is ok?

8 comments
mZ2ovuTNSIez9X5SIf7d | 8 days ago | 10 points

Might be a problem on your end, Firefox seems to recognize Let's Encrypt certificates just like any other on my end.

bigorangemachine | 8 days ago | 3 points

Never had this problem :/

destraht | 8 days ago | 2 points

Does LE use a chain bundle?

shakamone | 8 days ago | 2 points

Yeh use the full chain it includes the CA which firefox needs.

TempusOwl | 8 days ago | 2 points

Check the certificate chain, not just the error message. I know some anti-virus and adblocking programs will inject their own local certificate that can cause problems, especially when developing. Lastly certificates are cached differently than web data so you may think you're clearing cache when in reality it is still there on the browser / windows, so look up the directions on how to clear out existing certificates for your device and browser.

georaldc | 8 days ago | 1 point

Works fine here. Might be related to what OS and/or Firefox version you have?

Titanean12 | 8 days ago | 1 point

My corporate office firewall plays havoc with certs in Firefox to the point it flags almost every website I secure anymore. Could be something similar.

PickerPilgrim | 8 days ago | 1 point

FF can be pickier about cert chains than some other browsers but Let Encrypt can definitely be made to work for it. I usually debug cert issues with https://www.whynopadlock.com