Error Code Ssl_Error_No_Cypher_Overlap Firefox 38
Error Code Ssl_Error_No_Cypher_Overlap Firefox 38

How to Resolve the SEC_ERROR_BAD_SIGNATURE in Firefox

Why does Firefox keep getting the SEC ERROR BAD SIGNATURE error?

Because of the error message, you might not be able to access websites like Facebook or other similar services. This problem may be caused by the following:

  • The presence of third-party antivirus software on your machine is the most common cause. When you use software of this kind, it will frequently prevent you from accessing certain websites.
  • Firefox Add-ons: The Firefox add-ons that you have installed may also be the source of the problem. There is a possibility that one of them is causing interference with certifications, which led to the appearance of the error message. Launching Firefox in Safe Mode will help fix this issue.
  • The error notification could potentially be caused by the settings you have for your Firefox Network. It’s possible that the problem is caused by using a proxy.
  • So, let’s get into the answers: it’s possible that some of the remedies won’t work for you because the piece in question is not what’s causing your problem. Therefore, please adhere to each of them in order to find a solution quickly.
  • Check out this article for more information: How to Fix the “XULRunner Platform Version Is Not Compatible” Error

Solution 1: Disable Third-Party Antivirus

Stop using any third-party antivirus software that you have installed on your computer as soon as you get the error alert. When you have antivirus software installed on your machine, it will commonly limit your system’s connectivity to the internet and prohibit you from accessing certain websites. Therefore, turn off your antivirus program and close your browser to see if that resolves the issue.

In the event that it does work, you will need to make an exception in your antivirus software for the network settings in Firefox.

Option 2: Fire up Firefox in its “Safe Mode” configuration.

Extensions installed on your browser have the potential to interfere with certain connections and certifications, causing you to experience difficulties. Launching Firefox in Safe Mode will turn off any extensions you have installed and will restore the browser to its factory settings. In the event that this is helpful, you will need to deactivate each extension in turn until you determine which one is causing the issue. Start Firefox in safe mode:

  1. Launch Mozilla Firefox.
  2. By pressing the menu button in the top right corner of the window, the “Restart with Add-ons Disabled” option can be activated.
  3. Firefox will now launch in Safe Mode by default.
  4. Altering the Settings of the Network (Solution 3)

You also have the option of modifying Firefox’s Network settings. It is recommended that you turn off the proxy settings in Firefox if you do not use one. If you do, you should evaluate it in relation to other web browsers. How to disable or remove Proxy:

Solution 3: Changing Network Settings

  1. Choose Settings from the drop-down menu under the Menu button.
  2. Under “General,” look for “Network Settings” towards the bottom of the page.
  3. Visit the Settings menu.
  4. No Proxy, continue by clicking OK.
  5. Simply closing the Tab will save your modifications.
  6. Attempt to reopen Firefox.
  7. See if that makes a difference.

Check out this article for more information: How to Fix the Sec Error Cert Signature Algorithm Disabled

User Questions:


Because there was not enough data to authenticate your request, the page you requested could not be shown. SEC ERROR BAD SIGNATURE Due to a lack of appropriate data authentication, the page that you requested could not be displayed.

Find out how to fix certificate errors with Firefox here.

  1. To access the Advanced menu, navigate to Tools > Options.
  2. Choose the Encryption option.
  3. Click the View Cert button.
  4. Head on over to Servers.
  5. Find the z/OSMF CertAuth entry in the column labeled Certificate Name.
  6. Delete the certificate files that are located under the z/ OSMF directory.


How do I make sure that a connection I make using Firefox is secure?

  1. Verify Date and Time. Our personal computers and web browsers use security certificates to verify that a website is trustworthy.
  2. erasing all of the browsing history in the browser.
  3. Please refresh the website.
  4. Using certificates that have been self-signed in Firefox
  5. Click Privacy & Security, and then click View Certs once you’re there.
  6. Add an exception under the Servers tab.
  7. Check to see if the option to Save this Exception is turned on.
  8. Confirm the Existence of a Security Exception
  9. Check out this article as well: How to Fix SSL Error RX Record Too Long


The UNKNOWN ISSUER message almost always indicates that there is a third party intervening between Firefox and the website. It’s possible that the parental controls or security software you’re using is safe, but it might also be malicious software or even the government spying on you.