Hello, If this is a public website (no paywalls or logins -- we do not want private information), please post it so that we can see what the issue is. In the meantime, please post screenshots and an explanation as a separate post (as the website link will mean a moderator will have to manually allow the message).

Please explain the problem in detail. What happens? What are the exact error messages? 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-firefox-did-not-connect https://support.mozilla.org/en-US/kb/websites-dont-load-troubleshoot-and-fix-errors [https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean What do the security warning codes mean]