forked from mirrors/gecko-dev
129 lines
7.3 KiB
HTML
129 lines
7.3 KiB
HTML
<!DOCTYPE html>
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<!-- This Source Code Form is subject to the terms of the Mozilla Public
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- License, v. 2.0. If a copy of the MPL was not distributed with this
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- file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
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<html>
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<head>
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<meta http-equiv="Content-Security-Policy" content="connect-src https:; default-src chrome:; object-src 'none'">
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<meta name="referrer" content="no-referrer">
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<meta charset="UTF-8">
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<link rel="stylesheet" type="text/css" href="chrome://browser/skin/offlineSupportPages.css">
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<link rel="icon" type="image/png" id="favicon" href="chrome://branding/content/icon32.png"/>
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<title>Secure connection failed and Firefox did not connect</title>
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</head>
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<body>
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<div id="offlineSupportContainer">
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<h1>Secure connection failed and Firefox did not connect</h1>
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<p>This article explains why you may see a <em>Secure Connection Failed</em> or a <em>Did Not Connect: Potential
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Security Issue</em> error page and what you can do.
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</p>
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<div id="toc">
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<h2>Table of Contents</h2>
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<ul>
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<li class="toclevel-1"><a href="#w_secure-connection-cannot-be-established"><span class="tocnumber">1</span>
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<span class="toctext">Secure connection cannot be established</span></a>
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<ul>
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<li class="toclevel-2"><a href="#w_secure-connection-failed"><span class="tocnumber">1.1</span>
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<span class="toctext">Secure Connection Failed</span></a>
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</li>
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<li class="toclevel-2"><a href="#w_did-not-connect-potential-security-issue">
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<span class="tocnumber">1.2</span>
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<span class="toctext">Did Not Connect: Potential Security Issue</span></a>
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</li>
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</ul>
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</li>
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<li class="toclevel-1"><a href="#w_website-issues"><span class="tocnumber">2</span>
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<span class="toctext">Website issues</span></a>
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<ul>
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<li class="toclevel-2"><a href="#w_tls-version-unsupported"><span class="tocnumber">2.1</span>
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<span class="toctext">TLS version unsupported</span></a>
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</li>
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<li class="toclevel-2"><a href="#w_hsts-required"><span class="tocnumber">2.2</span>
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<span class="toctext">HSTS required</span></a>
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</li>
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</ul>
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</li>
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<li class="toclevel-1"><a href="#w_security-software-conflict"><span class="tocnumber">3</span>
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<span class="toctext">Security software conflict</span></a>
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</li>
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<li class="toclevel-1"><a href="#w_incorrect-system-clock"><span class="tocnumber">4</span>
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<span class="toctext">Incorrect system clock</span></a>
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</li>
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<li class="toclevel-1"><a href="#w_other-secure-connection-issues"><span class="tocnumber">5</span>
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<span class="toctext">Other secure connection issues</span></a>
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</li>
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</ul>
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</div>
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<h1 id="w_secure-connection-cannot-be-established">Secure connection cannot be established</h1>
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<p>When a website that requires a secure (<strong>https</strong>)
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connection tries to secure communication with your computer, Firefox cross-checks this attempt to make sure that
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the website certificate and the connection method are actually
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secure. If Firefox cannot establish a secure connection, it will display an error page.
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</p>
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<h2 id="w_secure-connection-failed">Secure Connection Failed</h2>
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<p>A <em>Secure Connection Failed</em> error page will include a description of the error, an option to report the
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error to Mozilla and a <span class="button">Try Again</span> button. There is no option to add a security exception to
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bypass this type of error.
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</p>
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<p>
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</p>
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<p>The error page will also include the following information:</p>
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<ul>
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<li>
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<em>The page you are trying to view cannot be shown because the authenticity of the received data could not
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be verified.</em>
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</li>
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<li>
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<em>Please contact the website owners to inform them of this problem.</em>
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</li>
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</ul>
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<h2 id="w_did-not-connect-potential-security-issue">Did Not Connect: Potential Security Issue</h2>
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<p>Certain secure connection failures will result in a <em>Did Not Connect: Potential Security Issue</em> error
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page.
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</p>
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<p>
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</p>
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<p>The error page will include a description of the potential security threat, an option to report the error to
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Mozilla and an <span class="button">Advanced…</span> button to view the error code and other technical details.
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There is no option to add a security exception to visit the website.
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</p>
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<h1 id="w_website-issues">Website issues</h1>
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<h2 id="w_tls-version-unsupported">TLS version unsupported</h2>
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<p>Some websites try using outdated (no longer secure) Transport
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Layer Security(<em>TLS</em>) mechanisms in an attempt to secure your connection. Firefox protects you by
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preventing navigation to such sites if there is a problem in securely establishing a connection. Contact the
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owners of the website and ask them to update their TLS version to a version that is still current and still secure.
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</p>
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<p>Starting in Firefox version 74, the minimum TLS version allowed by default is TLS 1.2. Websites that don't support
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TLS version 1.2 or higher will display a <em>Secure
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Connection Failed</em> error page with Error code: SSL_ERROR_UNSUPPORTED_VERSION and a message that <em>This website
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might not support the TLS 1.2 protocol, which is the minimum version supported by Firefox.</em> The error page may
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also include a button, <span class="button">Enable TLS 1.0 and 1.1</span> that will allow you to override the
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minimum TLS requirement; however, Mozilla plans to remove this option and permanently disable TLS 1.0 and 1.1 in
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a future version of Firefox.
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</p>
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<h2 id="w_hsts-required">HSTS required</h2>
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<p>Other websites may require HTTP
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Strict Transport Security (HSTS) and will not allow access with an insecure connection.
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</p>
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<h1 id="w_security-software-conflict">Security software conflict</h1>
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<p>Many security products use a feature that intercepts secure connections by default. This can produce connection
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errors or warnings on secure websites. If you see secure connection errors on multiple secure websites, updating
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your security product or modifying its settings may resolve the issue.
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</p>
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<p>
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<span class="for" data-for="win8,win10">
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Alternatively, you can uninstall third-party security software and use Windows Defender,
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the built-in antivirus on Windows 8 and Windows 10.
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</span>
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</p>
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<p>
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</p>
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<h1 id="w_incorrect-system-clock">Incorrect system clock</h1>
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<p>Firefox uses certificates on secure websites to ensure that your information is being sent to the intended
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recipient and can't be read by eavesdroppers. An incorrect system date can cause Firefox to detect that the website's
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security certificate is expired or invalid. Make sure your computer is set to the correct date, time and time zone.
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</p>
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</div>
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</body>
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</html>
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