This thread was archived. Please ask a new question if you need help.
Brand new installation and Firefox will not open ANY https:// web site
Brand new computer. iMac. OS 10.12.6 (16G1212)
Dowloaded latest version from Mozilla website. Absolutely NO website that is https:// secured will open and that includes https://support.mozilla.org. Error states Mozilla (or whomever) has misconfigured their web site and it is not secure. Security unknown.
Problem resolved but all info regarding Avast is wrong and should be updated. Still enough to figure out a fix, ThanksRead this answer in context 👍 0
All Replies (3)
There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connections and send their own certificate.
- uses an invalid security certificate SSL_ERROR_BAD_CERT_DOMAIN
- configured their website improperly
How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites https://support.mozilla.org/en-US/kb/troubleshoot-SEC_ERROR_UNKNOWN_ISSUER
Modified by FredMcD
Problem resolved but all info regarding Avast is wrong and should be updated. Still enough to figure out a fix, Thanks