If Firefox can't access a secure site (one that starts with '''https''') you will see an error page with the heading '''Secure Connection Failed''' and a message about the error. * If you see this heading without accessing a secure site, see [[Troubleshooting extensions and themes]]. *If you see the error message '''Your connection is not secure''', see the article [[What does "Your connection is not secure" mean?]]. * For troubleshooting other error messages, see [[Websites don't load - troubleshoot and fix error messages]]. __TOC__ = Secure connection cannot be established = When a website you visit attempts to secure communication between your computer and the website, Firefox cross-checks this attempt to ensure that the certificate and the method the website is using are actually secure. == Website issues == Some websites try using out-dated (no longer secure) [http://en.wikipedia.org/wiki/Transport_Layer_Security ''TLS''] mechanisms in an attempt to secure your connection. Firefox protects you by preventing navigation to such sites if there is a problem in securely establishing a connection. When this happens, you will see an error page with the option to report the error to Mozilla. <!-- The above is copied from https://support.mozilla.org/en-US/kb/tls-error-reports/revision/93059 (TLS Error Reports now redirects - see https://support.mozilla.org/en-US/kb/what-does-your-connection-is-not-secure-mean/discuss/6480#post-13160 --> ;[[Image:Fx45 Report SSL Errors]] If you experience this problem, contact the owners of the website and ask them to update their TLS version to a version that is still current and still secure. == Security software conflict == If you use an [https://www.eset.com ESET] security product such as NOD32 Antivirus or ESET Internet Security, turning off one of the following settings and then turning it back on may help eliminate the error. *'''Enable application protocol content filtering''' *'''Enable SSL/TLS protocol filtering''' For detailed instructions, see [http://www.askvg.com/fix-secure-connection-failed-problem-in-mozilla-firefox-web-browser/ this AskVG.com article]. If you have questions or concerns about modifying these settings, please visit [http://support.eset.com/ ESET support].<!-- See https://support.mozilla.org/questions/1174146 and https://support.mozilla.org/en-US/kb/secure-connection-failed-error-message/discuss/7169 --> == Incorrect date settings == If the date is not correct on your system, this can cause Firefox to detect that the website's security certificate is expired or invalid. You should ensure that your system is set to the correct date, time and time zone. = Certificate warnings = Firefox uses certificates on secure websites to ensure that your information is being sent to the intended recipient and can't be read by eavesdroppers. For a list of certificate warnings and error codes, see the article [[What does "Your connection is not secure" mean?]].

If Firefox can't access a secure site (one that starts with https) you will see an error page with the heading Secure Connection Failed and a message about the error.

• If you see this heading without accessing a secure site, see Troubleshoot extensions, themes and hardware acceleration issues to solve common Firefox problems.
• If you see the error message Your connection is not secure, see the article What do the security warning codes mean?.
• For troubleshooting other error messages, see Websites don't load - troubleshoot and fix error messages.

Secure connection cannot be established

When a website you visit attempts to secure communication between your computer and the website, Firefox cross-checks this attempt to ensure that the certificate and the method the website is using are actually secure.

Website issues

Some websites try using out-dated (no longer secure) TLS mechanisms in an attempt to secure your connection. Firefox protects you by preventing navigation to such sites if there is a problem in securely establishing a connection. When this happens, you will see an error page with the option to report the error to Mozilla.

If you experience this problem, contact the owners of the website and ask them to update their TLS version to a version that is still current and still secure.

Security software conflict

If you use an ESET security product such as NOD32 Antivirus or ESET Internet Security, turning off one of the following settings and then turning it back on may help eliminate the error.

• Enable application protocol content filtering
• Enable SSL/TLS protocol filtering

For detailed instructions, see this AskVG.com article. If you have questions or concerns about modifying these settings, please visit ESET support.

Incorrect date settings

If the date is not correct on your system, this can cause Firefox to detect that the website's security certificate is expired or invalid. You should ensure that your system is set to the correct date, time and time zone.

Certificate warnings

Firefox uses certificates on secure websites to ensure that your information is being sent to the intended recipient and can't be read by eavesdroppers. For a list of certificate warnings and error codes, see the article What do the security warning codes mean?.