Secure connection failed and Firefox did non connect

This article explains why you lot may encounter a Secure Connection Failed or a Did Non Connect: Potential Security Effect error page, and what you can do.

  • If you see a Alert: Potential Security Risk Ahead fault page, run across the What practise the security warning codes mean? article.
  • To troubleshoot other error messages, see Websites don't load - troubleshoot and fix error letters.

Tabular array of Contents

  • 1 Secure connection cannot be established
    • ane.1 Secure Connection Failed
    • 1.2 Did Non Connect: Potential Security Issue
  • two Website issues
    • 2.one TLS version unsupported
    • 2.ii HSTS required
  • iii Security software conflict
  • 4 Wrong organization clock
  • 5 Other secure connectedness bug

Secure connection cannot be established

When a website that requires a secure (HTTPS) connexion tries to secure communication with your figurer, Firefox cross-checks this attempt to make sure that the website certificate and the connexion method are really secure. If Firefox cannot institute a secure connexion, it volition display a Secure Connection Failed or Did Not Connect: Potential Security Effect error page.

Secure Connectedness Failed

A Secure Connection Failed error page volition include a description of the error and a Try Again push. There is no option to add a security exception to bypass this type of error.

Fx91SecureConnectionFailed Fx97SecureConnectionFailed


The error page will also include the following information:

  • The folio you are trying to view cannot be shown because the authenticity of the received data could non be verified.
  • Please contact the website owners to inform them of this problem.

Did Not Connect: Potential Security Consequence

Certain secure connexion failures volition effect in a Did Not Connect: Potential Security Issue fault page.

Fx91SecError-DidNotConnect Fx97SecError-DidNotConnect

The fault page will include a clarification of the potential security threat and an Advanced… push button to view the error code and other technical details. There is no pick to add a security exception to visit the website.

Website problems

TLS version unsupported

Some websites attempt using outdated (no longer secure) Transport Layer Security (TLS) mechanisms in an endeavour to secure your connexion. Firefox protects you past preventing navigation to such sites if there is a problem in deeply establishing a connection. Contact the owners of the website and ask them to update their TLS version to a version that is still current and still secure.

Since Firefox version 78, the minimum TLS version allowed by default is TLS 1.2. Websites that don't support TLS version 1.2 or college will display a Secure Connection Failed error page with Error code: SSL_ERROR_UNSUPPORTED_VERSION and a bulletin that says, This website might not support the TLS 1.two protocol, which is the minimum version supported past Firefox. For more information, meet this Mozilla weblog mail service.

Fx97SecureConnectionFailed-TLS

Fx95SecureConnectionFailed-TLS

The fault folio push button, Enable TLS 1.0 and i.1 allows y'all the option to override the minimum TLS requirement.

Note: The option to enable TLS 1.0 and 1.one has been removed from the error folio in Firefox version 97.

HSTS required

Other websites may crave HTTP Strict Transport Security (HSTS) and will not allow admission with an insecure connection.

Security software conflict

Many security products utilize a feature that intercepts secure connections by default. This tin produce connection errors or warnings on secure websites. If yous run across secure connection errors on multiple secure websites, updating your security production or modifying its settings may resolve the result. See this article's section on Antivirus products for assist with specific security products that can produce these errors, such as Avast, AVG and ESET software.

Alternatively, y'all tin uninstall 3rd-party security software and use Windows Defender, the built-in antivirus.

Incorrect arrangement clock

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. An incorrect system date can cause Firefox to detect that the website'due south security document is expired or invalid. Make certain your computer is gear up to the correct date, time and time zone. For more data, see How to troubleshoot time related errors on secure websites.

Other secure connection issues

These articles describe how to troubleshoot some specific secure connection errors:

  • Certificate Pinning Reports
    Error code: MOZILLA_PKIX_ERROR_KEY_PINNING_FAILURE
  • Document contains the same serial number every bit another document
    Error code: SEC_ERROR_REUSED_ISSUER_AND_SERIAL

For a list and brief clarification of other secure connexion errors, see NSS and SSL Error Codes in Firefox documentation.

These fine people helped write this article:

AliceWyman, Bo102010, philipp, jscher2000 - Support Volunteer, Underpass, Tonnes, Michele Rodaro, Roland Tanglao, Michael Verdi, scoobidiver, Swarnava Sengupta, ideato, user633449, Mozinet, Wesley Branton, Lan, Joni, Artist, mwrr, YD, Rashid, Danny Colin, PGGWriter

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