How to Resolve the Sec_Error_Cert_Signature_Algorithm_Disabled

How to Resolve the Sec_Error_Cert_Signature_Algorithm_Disabled

Here we can see, “How to Resolve the Sec_Error_Cert_Signature_Algorithm_Disabled”

If you try to access specific websites using the Firefox browser, you may receive the following error code: sec_error_cert_signature_algorithm_disabled. Before this, most impacted users said the online pages could be seen without trouble. The bug affects both Windows and Mac machines.

Is there a fix for sec_error_cert_signature_algorithm_disabled error?

We looked into this issue by looking at multiple user reports and the most common repair procedures used by most impacted users. Based on our research, there are multiple known causes of this error:

  • Affected users have reported success in resolving the issue by changing the Firefox profile folder to ignore certificates and exceptions that may be causing the issue. Delete cert override.txt and modify cert9.db or cert8.db.
  • The security alert is due to adware: E-rewards. Adware front apps like Notify App also cause this error message. If this is the case, finding them and removing them from your system will fix the problem.
  • Malware infection: Browser hijackers have been confirmed to cause this issue. In this scenario, removing the malware and reinstalling Firefox should fix the issue.
  • Avast has a history of false positives with Firefox due to sending out IIRC connection data. In this situation, deactivating HTTPS scanning should resolve the issue.
  • If you’re running a 64-bit version of Firefox with Kaspersky, chances are your Firefox installation lacks the antivirus root certificate. In this scenario, a trip to the Certificates menu should suffice.
  • If you’re having difficulties with this Firefox issue, this article will show you numerous troubleshooting procedures that other users in similar situations have done to repair it. Please follow the approaches in order of efficiency and harshness until you find one that works for you.
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Method 1: Renaming cert.db & deleting cert_override.txt

It appears that renaming cert8.db or cert9.db files and deleting cert override.txt from the Firefox profile folder fixed the issue for some people. This should fix the sec_error_cert_signature_algorithm_disabled error.

Here’s a simple guide:

  1. Click the Action button in the top-right corner of Firefox. Select Troubleshooting Information from the newly presented menu.
  2. On the Troubleshooting Information screen, click the Profile folder’s Open Folder button.
  3. Close your current Firefox profile so we can make the modifications.
  4. Click Rename on cert9.db or cert8.db (depending on the Firefox version installed) once Firefox is closed. After the ‘.db’ extension, add a ‘.old’ and push Enter to save. So the browser will ignore the current Database file and produce a new one at startup.
  5. If you can’t see the extension of your files in File Explorer, click on the View tab (top ribbon bar) and check the box for Hidden Items.
  6. Select Delete from the context menu to erase any intermediate certificates and exceptions Firefox is currently keeping.
  7. After making these two modifications, restart your Firefox browser to see whether the problem persists.

If the error notice persists, try the next method.

Method 2: Remove Adware App

sec_error_cert_signature_algorithm_disabled error is known to be caused by numerous malware/adware products. While this problem has numerous causes, the E-Rewards Notify App is the most commonly reported culprit.

Several impacted users stated that the issue was addressed after uninstalling the adware via the Programs and Features window. Here’s a simple guide:

  1. To launch the Run dialogue, press Windows + R. Enter “appwiz.cpl” to open the Programs and Features list.
  2. Once inside the Programs and Features box, scan the list for any suspicious programs that may have been used to install adware. The most common adware variant known to cause this problem is E-Rewards Notify App.
  3. Note: It may help to via Installed On if you know when the issue originated.
  4. Right-click it and select Uninstall. Then, follow the on-screen instructions to uninstall.
  5. Restart your computer after uninstalling it.
  6. Check if the issue has been repaired by visiting the same websites that previously triggered the error.

If the sec_error_cert_signature_algorithm_disabled error notice persists, try the next method.

Method 3: Scan for malware

If you couldn’t find and remove the adware/malware causing the issue, your only option is to use a security scanner. A virus scan found and removed a nasty browser hijacker for some afflicted customers.

Malwarebytes is one of the best free security scanners we’ve used to deal with browser hijackers. To rule out malware/adware producing the sec_error_cert_signature_algorithm_disabled error, run a deep scan with Malwarebytes (here).

After the scan is finished, restart your computer and reinstall Firefox. In the case of a browser hijacker, some infected browser files may have been destroyed during the cleanup process.

Method 4: Disable HTTPS filtering (Avast only)

Users of Avast have reported this issue! Antivirus. Avast! may falsely detect a MITM (man in the middle) attack on your machine in some cases.

We looked into this thoroughly and found that AVAST! is renowned for giving out connection data (IIRC), resulting in the sec_error_cert_signature_algorithm_disabled error in Firefox.

If this is the case, click Avast Settings, navigate to Main settings, and deactivate the checkbox related to Enable HTTPS scanning.

After modifying, restart your computer to see if the issue is resolved.

If this method doesn’t work, move on to the next one.

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Method 5: Install Kaspersky’s root certificate manually in Firefox

The sec_error_cert_signature_algorithm_disabled error occurs when a 64-bit Firefox installation lacks the antivirus root certificate.

If this is the case, here is an easy fix:

  1. Open Firefox, click the action button in the upper right, then Options.
  2. From the Options tab, select Privacy & Security, then scroll down to Certificates and select View Certificates.
  3. Within Certificate Manager, select the Authorities tab and then Import.
  4. Once in the import menu, enter the following address and hit Enter. Then click Open on the Root Certificate in that folder.
  5. Before clicking Ok, make sure all trust boxes are checked.
  6. Restart your browser to see if the problem is fixed.

If the sec_error_cert_signature_algorithm_disabled error persists, try the next method.

Method 6: Adjusting the security.pki.sha1_enforcement_level value

Some users who had difficulty accessing Facebook Workspace and other similar services claimed that the issue was fixed after adjusting the Security Enforcement Level in Firefox’s advanced settings.

This will enable your Firefox browser to accept SHA-1 certificates without further verification, therefore resolving the issue. Taking this route may expose your internet sessions to security threats.

If you choose this route, you must:

  1. Press Enter after typing ‘about:config’ in the navigation bar to access advanced settings.
  2. Click the I accept the risk! Button.
  3. Enter “security.pki.sha1” in the search box to find the value that needs change.
  4. After that, double-click security.pki.sha1 enforcement level;3 and modify its value to 4.
  5. Restart your browser to check if that helps.

User Questions:

What is the significance of Sec error bad signature?

The signature on Peer’s certificate is invalid. As a result of this issue, you will not be able to log in. You can’t see the page you’re looking for because the legitimacy of the data you’ve received can’t be confirmed.

How can I repair the error code SEC_ ERROR_ BAD_ SIGNATURE?

  1. Activate Mozilla Firefox and then press Ctrl + Shift + Delete.
  2. As soon as you see the drop-down menu, select “Everything.”
  3. Click the Clear Now button after checking all the boxes.
  4. Try again after restarting Mozilla Firefox.

How can I solve the program that prevents Firefox from securely connecting to this site?

  1. Ensure that your anti-virus software is always up to date (i.e., you are running the latest version).
  2. Re-add Firefox to your trusted or recognized apps list after removing it. See Configure firewalls so that Firefox can access the Internet for complete information.
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Is there a way to clear the browser’s cache?

Using the three-dot menu icon (top-right or bottom-right, depending on where you’ve set your toolbar) in the corner of the Firefox app for Android, click Settings. Choose “Delete browsing data” from the “Privacy and security” section.

In Firefox, how can I allow a self-signed certificate to be accepted?

  1. To view certificates, go to Preferences -> Privacy & Security -> View Certificates.
  2. Click on the Add Exception button under the Servers Tab.
  3. This exception should be permanently stored.
  4. Click the Confirm Security Exception button.