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connection, secure, certificate, rc4

When connecting to a website that uses an invalid TLS certificate or weak encryption, Firefox will display an error page saying "Your connection is not secure".

{for not fx44} When Firefox connects to a secure website (the URL begins with "http'''s'''://"), it must verify that the certificate presented by the website is valid and that the encryption is strong enough to adequately protect your privacy. If the certificate cannot be validated or if the encryption is not strong enough, Firefox will stop the connection to the website and instead show an error page. On some websites there is an option to report secure connection errors to Mozilla for statistical purposes: ;[[Image:report tls error]] To troubleshoot secure connection problems with the error message '''Secure Connection Failed''', see the [[Troubleshoot the "Secure Connection Failed" error message]] article. {/for} {for fx44} When Firefox connects to a secure website (the URL begins with "http'''s'''://"), it must verify that the certificate presented by the website is valid and that the encryption is strong enough to adequately protect your privacy. If the certificate cannot be validated or if the encryption is not strong enough, Firefox will stop the connection to the website and instead show an error page: [[Image:Fx44 Insecure Connection]] * To troubleshoot secure connection problems with the error message '''Secure Connection Failed''', see the [[Troubleshoot the "Secure Connection Failed" error message]] article. __TOC__ = What to do if you see this error? = If you encounter such an error message, if possible, you should contact the owners of the website and inform them of the error. It is recommended that you wait for the website to be fixed before using it. The safest thing to do is to click {button Go Back}, or to visit a different website. Unless you know and understand the technical reason why the website presented incorrect identification, and are willing to risk communicating over a connection that could be vulnerable to an eavesdropper, you should not proceed to the website. = Technical information = Click on {button Advanced} for more information on why the connection is not secure. Some common errors are described below: == Certificate will not be valid until ''(date)'' == {note}(site name) uses an invalid security certificate. The certificate will not be valid until (date). <br>(Error code: sec_error_expired_issuer_certificate){/note} The error text will also show the current date and time of your system. In case this is incorrect, set your system clock to today's date and time{for win} (double-click the clock icon on the Windows Taskbar){/for} in order to fix the problem. == The certificate expired on ''(date)'' == {note}(site name) uses an invalid security certificate. The certificate expired on (date). <br>(Error code: sec_error_expired_certificate){/note} This error occurs when a website's identity certification has expired. The error text will also show the current date and time of your system. In case this is incorrect, set your system clock to today's date and time{for win} (double-click the clock icon on the Windows Taskbar){/for} in order to fix the problem. == The certificate is not trusted because no issuer chain was provided == {note}''(site name)'' uses an invalid security certificate. The certificate is not trusted because no issuer chain was provided. <br>(Error code: sec_error_unknown_issuer){/note} {for win8} {note}'''Note:''' If you see this error message on major sites like Google, Facebook, YouTube and others in user accounts protected by Microsoft Family Safety filter, please refer to Microsoft's documentation for Windows Update [https://support.microsoft.com/en-us/kb/2965142#bookmark-2 KB2965142] (published on 6/9/2014) and Windows Update [https://support.microsoft.com/en-us/kb/2981655 KB2981655] (published on 8/11/2014).{/note}{/for} {for win10} {note}'''Note:''' You may currently see this error message on major sites like Google, Facebook, YouTube and others on Windows 10 in user accounts protected by Microsoft family settings. To turn these settings off for a particular user, see the Microsoft support article, [http://windows.microsoft.com/en-us/windows-10/turn-off-microsoft-family-settings Turn off family settings in Windows 10].{/note}{/for} You may have enabled SSL scanning in your security software such as Avast, Bitdefender, ESET or Kaspersky. Try to disable this option. More details about this are available in the support article [[How to troubleshoot the error code "SEC_ERROR_UNKNOWN_ISSUER" on secure websites]]. == The certificate is not trusted because the issuer certificate is unknown == {note}''(site name)'' uses an invalid security certificate. The certificate is not trusted because the issuer certificate is unknown. <br>(Error code: sec_error_unknown_issuer){/note} The file {filepath cert8.db} in your profile folder may have become corrupted. Delete this file while Firefox is closed. #[[T:profileFolder]] #[[T:closeFirefox]] # Click on the file named {filepath cert8.db}. # Press {for mac}{key command}+{/for}{key Delete}. # Restart Firefox.{note}'''{filepath cert8.db} will be recreated when you restart Firefox. This is normal.'''{/note} == The certificate is not trusted because it is self-signed == {note}''(site name)'' uses an invalid security certificate. The certificate is not trusted because it is self-signed. <br>(Error code: sec_error_untrusted_issuer){/note} Self-signed certificates make your data safe from eavesdroppers, but say nothing about who the recipient of the data is. This is common for intranet websites that aren't available publicly. == Certificate is only valid for ''(site name)'' == {note}''(site name)'' uses an invalid security certificate. The certificate is only valid for ''(site name)''. <br>(Error code: ssl_error_bad_cert_domain){/note} This error is telling you that the identification sent to you by the site is actually for another site. While anything you send would be safe from eavesdroppers, the recipient may not be who you think it is. A common situation is when the certificate is actually for a different part of the same site. For example, you may have visited https://example<!---->.com, but the certificate is for https://'''www.'''example<!---->.com. In this case, if you access https://'''www.'''example<!---->.com directly, you should not receive the warning. = Bypassing the warning = You should only bypass the warning if you're confident in both the identity of the website and the integrity of your connection - even if you trust the site, someone could be tampering with your connection. Data you enter into a site over a weakly encrypted connection can be vulnerable to eavesdroppers as well. In order to bypass the warning page, click {button Advanced}: * On sites with a weak encryption you will then be shown an option to load the site using outdated security. * On sites which certificate cannot be validated, you might be given the option to add an exception. {warning}Legitimate public sites will '''not''' ask you to add an exception for their certificate - in this case an invalid certificate can be an indication of a web page that will defraud you or steal your identity.{/warning} = Reporting the Error = On some websites there is an option to report the error to Mozilla for statistical purposes: ;[[Image:report tls error]] {/for}