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Israel Belyaev
Israel Belyaev


For now I have:- Firefox version 82.0 Ubuntu error SEC_ERROR_BAD_SIGNATURE- Chromium version 86.0.4240.11 says certificate is valid- Konqueror 5.0.97 says certificate is valid- Epiphany 3.36.4 says certificate is valid

Fix SEC ERROR BAD SIGNATURE error in Firefox

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The SEC_ERROR_BAD_SIGNATURE error in Firefox prevents users from accessing websites on the browser. Since it is a browser-specific error, you might be able to access the website on other browsers. Before proceeding to any solution, it is necessary to verify whether the website is genuine or not by opening on another reliable browser (e.g. Chrome or Edge) and checking it out.SEC_ERROR_BAD_SIGNATURE error in FirefoxIf the website works fine with other browsers, the issue while opening it on Firefox could be caused by interference by an extension or an anti-virus. Other than this, proxy settings on your browser might be preventing you from accessing the website.Clear the cookies and cache files for FirefoxTurn off the Firewall and third-party anti-virus programs temporarilyLaunch Firefox in Safe ModeRemove Proxy settings from your Firefox browserYou can try the following solutions sequentially to resolve the problem:1] Clear the cookies and cache files for FirefoxBefore proceeding to further solutions, you could try clearing cookies and cache files for Firefox.if(typeof ez_ad_units!='undefined')ez_ad_units.push([[728,90],'thewindowsclub_com-medrectangle-4','ezslot_2',815,'0','0']);__ez_fad_position('div-gpt-ad-thewindowsclub_com-medrectangle-4-0');Click on the Library button and select History from the menu.

Click on Clear recent history.Make sure that the checkboxes corresponding to cookies and cache are both selected and then change the Time range to Everything.Now click on Clear now to delete the cookies and cache.Basically, the cache files store information associated with a website when you open it for the first time. It is stored as offline data and makes it quicker to open the website for further sessions. However, if the cache files are corrupt, it the error in the discussion would appear, thus preventing you from accessing the website.2] Turn off the Firewall & third-party anti-virus programs temporarilyMany third-party anti-virus programs are known to falsely flag genuine programs and websites as malicious and block them. The same is the case with the Windows Defender Firewall. To isolate this cause, you could temporarily disable the Windows Defender Firewall and the third-party anti-virus software installed on your system.if(typeof ez_ad_units!='undefined')ez_ad_units.push([[300,250],'thewindowsclub_com-banner-1','ezslot_6',819,'0','0']);__ez_fad_position('div-gpt-ad-thewindowsclub_com-banner-1-0');3] Launch Firefox in Safe ModeThe Safe Mode in Firefox is the mode in which the add-ons are disabled. Since one of the causes of the issue is troublesome extensions, you could try launching Firefox in Safe Mode to isolate this cause.Open Firefox and click on the Menu button.Select Help > Restart with Add-ons Disabled.This would launch Firefox in Safe Mode. Try opening your website. If it works fine in Safe Mode, you would have to find and delete the troublesome extension.To check the list of extensions, open the address about:addons on the Firefox browser and go to the Extensions tab. You could delete troublesome extensions from there.4] Remove Proxy settings from your Firefox browserThe Proxy settings on your browser could prevent you from accessing certain websites by causing the SEC_ERROR_BAD_SIGNATURE error. You could change them as follows:Click on the Menu button on the Firefox browser and select Options or enter about:preferences in the address bar.In the General section, scroll down to Network Settings and click on Settings.Now shift the radio button for Configure Proxy Access to the Internet to No proxy.Hit OK to save the settings.The solutions mentioned above should be helpful in resolving the SEC ERROR BAD SIGNATURE error in Firefox.

I tried logging into an account yesterday, after typing name and password it showed an error page saying bad signature on certificate. I do not have a screenshot. Error occurred only one time, I think it's a problem on the other end.

Only one thing The unsecured sites (http) will be not affectedBut when you will encounter a website that does not support TLS 1.2 but support TLS 1.0 the browser will shown this error (see screenshot)

No, the site uses https for everything, green lock and all. FWIW, I did receive the same error later in Monday, but it was not after a login but after clicking to check unread messages while I was logged in.

I have logged into that site, has to be a hundred or more times and that was the first time I saw that error ever. I've been on it today and everything is running smoothly. I was just worried my password may have leaked.

The certificate is not related to your password is related to the site owner ability to encrypt the information and assure you (and the browser too :)) that this information can't be viewed be unauthorized person. The certificate is per domain not per page. This error "sec_error_bad_signature" can be related to a self-signed certificate or to an intermediate certificate error.Intermediate certificates sit between an end entity certificate and a root certificates and create an additional layer of security that assure that the root certificate keys are inaccessible.Hope this help even if is a basic explanation.Have a good day.

I just want to confirm, firefox read the bad signature and did not send any information when I got the SEC_ERROR_BAD_SIGNATURE page, correct? If this is the case, you can mark this as solved. Thank you again

I renamed the cert8.db file and restarted FF. I now get the normal "untrusted" error then re-imported the private CA to make the "untrusted" error go away. However, that still gave me SEC_ERROR_BAD_SIGNATURE. So, something must've changed.

I knew it was related to the CA certificate. Sigh. OK, so there were two CA certificates with the same name and I only loaded one. One was SHA-1, the other one was SHA-256. I had the SHA-256 but not the SHA-1. The private URL I was trying to access was made with the SHA-1 and has yet to move over to the new SHA-256. Added the SHA-1 certificate resolved my issue. Mismatched certificate was the reason. I think this error needs to be more specific than just "bad signature". Hope this helps other people!

Deleting the cert8.db file as originally suggested here ended up being a hit-or-miss fix to the problem. For some users it worked swimmingly; others it did nothing at all. In fact, for some users even uninstalling Firefox and nuking their Firefox APPDATA folders, Registry Entries, and etc. did not fix the error.

Antivirus can also cause the Firefox error. If there is the antivirus installed in your computer, you need to check if Firefox is detected as the untruth software by it, if it is, remove Firefox from the list. Or you can disable the internet security option in the antivirus. When the two settings above don't take effect, you can disable the entire antivirus directly to check if the blocked websites are accessible in Firefox again.

The HyperText Transfer Protocol (HTTP) 406 Not Acceptable client error response code indicates that the server cannot produce a response matching the list of acceptable values defined in the request's proactive content negotiation headers, and that the server is unwilling to supply a default representation.

In practice, this error is very rarely used. Instead of responding using this error code, which would be cryptic for the end user and difficult to fix, servers ignore the relevant header and serve an actual page to the user. It is assumed that even if the user won't be completely happy, they will prefer this to an error code.

\n The HyperText Transfer Protocol (HTTP) 406 Not Acceptable\n client error response code indicates that the server cannot produce a response matching\n the list of acceptable values defined in the request's proactive content negotiation headers, and\n that the server is unwilling to supply a default representation.\n

\n In practice, this error is very rarely used. Instead of responding using this error\n code, which would be cryptic for the end user and difficult to fix, servers ignore the\n relevant header and serve an actual page to the user. It is assumed that even if the\n user won't be completely happy, they will prefer this to an error code.\n

A 400 Bad Request, also known as a\u00a0400 error\u00a0or\u00a0HTTP error 400, is perceived by the server as a generic client error and it is returned when the server determines the error doesn\u2019t fall in any of the other status code categories.\nThe key concept to understand here is that the 400 Bad Request error is something that has to do with the submitted request from the client\u00a0before\u00a0it is even processed by the server.\nThe Internet Engineering Task Force (IETF) defines the\u00a0400 Bad Request\u00a0as:\nThe 400 (Bad Request) status code indicates that the server cannot or will not process the request due to something that is perceived to be a client error (e.g., malformed request syntax, invalid request message framing, or deceptive request routing).\n"},"name":"What is a 400 Bad Request Error?","@type":"Question"},"acceptedAnswer":"@type":"Answer","text":"There are various root causes that can trigger the 400 Bad Request error and, even if this error isn\u2019t specific to any particular browser or OS (operating system), the fixes do vary slightly.\n\n\nURL String Syntax Error\nCorrupted Browser Cache & Cookies\nDNS Lookup Cache\nFile Size Too Large\nGeneric Server Error\n\n\n","name":"What Causes the HTTP 400 Bad Request Error?","@type":"Question","acceptedAnswer":"@type":"Answer","text":"Complete the steps outlined in this section to help diagnose and correct a 400 Bad Request.\nThe proposed solutions include:\n\n1. 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These kinds of messages are returned every time...","mainEntityOfPage":"https:\/\/\/blog\/http-status-codes\/","image":["@type":"ImageObject","url":"https:\/\/\/wp-content\/uploads\/2020\/02\/http-status-codes.png","width":1460,"height":730],"name":"A Complete Guide and List of HTTP Status Codes","sameAs":["http:\/\/\/entity\/Q1123288","http:\/\/\/resource\/List_of_HTTP_status_codes"],"url":"https:\/\/\/blog\/http-status-codes\/","@context":"http:\/\/","@id":"http:\/\/\/wl0150038\/knowledgebase\/what_is_dns__domain_name_system_explained","@type":"Thing","mainEntityOfPage":"https:\/\/\/knowledgebase\/what-is-dns\/","image":["@type":"ImageObject","url":"https:\/\/\/wp-content\/uploads\/2018\/05\/what-is-dns.png","width":1460,"height":730],"name":"What Is DNS? Domain Name System Explained","sameAs":["http:\/\/\/entity\/Q8767","http:\/\/\/resource\/Domain_Name_System","http:\/\/\/ns\/m.029zm"],"url":"https:\/\/\/knowledgebase\/what-is-dns\/","@context":"http:\/\/","@id":"http:\/\/\/wl0150038\/entity\/matteo_duo","@type":"Person","description":"Matteo Du\u00f2 is the Head of Content at Kinsta and Content Marketing Consultant for WordPress plugin developers. Connect with\u00a0Matteo on Twitter.","image":["@type":"ImageObject","url":"https:\/\/\/wp-content\/uploads\/2020\/12\/matteo-duo.jpeg","width":512,"height":512],"name":"Matteo Du\u00f2","sameAs":"https:\/\/\/matteoduo","@context":"http:\/\/","name":"webdev","@type":["Thing"],"@id":"http:\/\/\/wl0150038\/post_tag\/webdev","description":"","url":["https:\/\/\/blog\/tag\/webdev\/"],"mainEntityOfPage":"https:\/\/\/blog\/tag\/webdev\/","@context":"http:\/\/","name":"Dev environment questions","@type":["Thing"],"@id":"http:\/\/\/wl0150038\/knowledge_categories\/dev","description":"Use this page to browse our frequently asked questions regarding our development environment.","url":["https:\/\/\/knowledge_categories\/dev\/"],"mainEntityOfPage":"https:\/\/\/knowledge_categories\/dev\/","@context":"http:\/\/","name":"Chrome Errors","@type":["Thing"],"@id":"http:\/\/\/wl0150038\/term\/topic\/chrome_errors","description":"","mainEntityOfPage":"https:\/\/\/topic\/chrome-errors\/","@context":"http:\/\/","name":"Firefox Errors","@type":["Thing"],"@id":"http:\/\/\/wl0150038\/term\/topic\/firefox_errors","description":"","mainEntityOfPage":"https:\/\/\/topic\/firefox-errors\/","@context":"http:\/\/","name":"HTTP Status Codes","@type":["Thing"],"@id":"http:\/\/\/wl0150038\/term\/topic\/http_status_codes","description":"","mainEntityOfPage":"https:\/\/\/topic\/http-status-codes\/","@context":"http:\/\/","name":"Website Errors","@type":["Thing"],"@id":"http:\/\/\/wl0150038\/term\/topic\/website_errors","description":"","mainEntityOfPage":"https:\/\/\/topic\/website-errors\/"]li code,p code,.wp-block-code,.wp-block-kinsta-notice,.wp-block-kinsta-table-of-contents,.share-staticbackground-color: #f3f3f6;.related-posts background-color: #fafafa;li code,p code border-color: #f3f3f6; Skip to content Test a deployment on our modern App Hosting. 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