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2 devices both using same Firefox update 1 can access websites and the other can't with correct time setting

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I repeatedly receive" Your connection is not secure" with the Advanced detail" SEC_ERROR_UNKNOWN_ISSUER" on my desktop Firefox but my laptop still can access the problem sites on Firefox. Both are using WIN 10 and can access the websites using Google Chrome or IE11. Any suggestions? Many Thanks Stephen

I repeatedly receive" Your connection is not secure" with the Advanced detail" SEC_ERROR_UNKNOWN_ISSUER" on my desktop Firefox but my laptop still can access the problem sites on Firefox. Both are using WIN 10 and can access the websites using Google Chrome or IE11. Any suggestions? Many Thanks Stephen
FredMcD
  • Top 10 Contributor
4192 solutions 58521 answers
There is security software like Avast, Kaspersky, BitDefender and ESET that intercept secure connection certificates and send their own. https://support.mozilla.org/en-US/kb/firefox-cant-load-websites-other-browsers-can https://support.mozilla.org/en-US/kb/firefox-and-other-browsers-cant-load-websites https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message https://support.mozilla.org/en-US/kb/connection-untrusted-error-message [https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors?redirectlocale=en-US&redirectslug=Error+loading+web+sites Websites don't load - troubleshoot and fix error messages] http://kb.mozillazine.org/Error_loading_websites *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

Question owner

both devices are using Bitdefender.

both devices are using Bitdefender.
FredMcD
  • Top 10 Contributor
4192 solutions 58521 answers

Make sure they are the same version and up to date.

Make sure they are the same version and up to date.

Question owner

Both versions are up to date and the same.

Both versions are up to date and the same.