Cert served by FritzBox won´t work in FireFox 47

Help
1

I’ve just got certificates and imported those on my FritzBox router. Serving the fritzbox admin ui over SSL works fine on Safari and Chrome but Firefox 47 complains: SEC_ERROR_UNKNOWN_ISSUER

Firefox claims (translated): the certificate is not verified since the issues is unknown.

What I’ve uploaded to the fritzbox is the concatenated cert.pem and privkey.com

DNS name available per pm.

Note: Firefox does not show a hierarchy of this certificate. Maybe the concatenation should include others files, too, before uploading to the fritzbox?

Thanks,
Andreas

2

You need to also serve the intermediate certificate, which you can find in chain.pem or fullchain.pem. How to configure that depends a bit on what web server is being used, but there is an additional object that needs to be a part of the configuration beyond cert.pem and privkey.pem.

3

You’re not serving the intermediate cert. Use fullchain.pem instead of cert.pem or concatenate cert.pem, chain.pem and privkey.pem which has the same result.

4

Thank you both. Had read about an additional certificate option for Apache but wasn’t sure how to handle this for the FritzBox.

Summary: for using letsencrypt with the FritzBox you need to concat the fullcert and private key and upload the resulting file:

cat fullcert.pem privkey.pem > fritzbox.pem

5

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