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This can produce connection errors or warnings on secure websites. Many security products use a feature that intercepts secure connections by default. Other websites may require HTTP Strict Transport Security (HSTS) and will not allow access with an insecure connection. For more information, see this Mozilla page. Note: Mozilla plans to remove this option and permanently disable TLS 1.0 and 1.1 in a future version of Firefox. The error page may also include a button, Enable TLS 1.0 and 1.1 that will allow you to override the minimum TLS requirement. Websites that don't support TLS version 1.2 or higher will display a Secure Connection Failed error page with Error code: SSL_ERROR_UNSUPPORTED_VERSION and a message that This website might not support the TLS 1.2 protocol, which is the minimum version supported by Firefox. Starting in Firefox version 78, the minimum TLS version allowed by default is TLS 1.2. Firefox protects you by preventing navigation to such sites if there is a problem in securely establishing a connection.Ĭontact the owners of the website and ask them to update their TLS version to a version that is still current and still secure. Some websites try using outdated (no longer secure) Transport Layer Security ( TLS) mechanisms in an attempt to secure your connection. There is no option to add a security exception to visit the website.
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The error page will include a description of the potential security threat, an option to report the error to Mozilla and an Advanced… button to view the error code and other technical details.
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There is no option to add a security exception to bypass this type of error. If Firefox cannot establish a secure connection, it will display a Secure Connection Failed or Did Not Connect: Potential Security Issue error page.Ī Secure Connection Failed error page will include a description of the error, an option to report the error to Mozilla and a Try Again button. When a website that requires a secure ( https) connection tries to secure communication with your computer, Firefox cross-checks this attempt to make sure that the website certificate and the connection method are actually secure.
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