What is ‘Error Code sec_error_reused_issuer_and_serial’ error in Firefox in Windows 10?

In this post, we are going to discuss on How to fix Error Code sec_error_reused_issuer_and_serial Windows 10, Error Code sec_error_reused_issuer_and_serial error Firefox in Windows 10. You will be guided with easy steps/methods to resolve the issue. Let’s starts the discussion.

‘Error Code sec_error_reused_issuer_and_serial’: It is common Windows Problem considered as browser error. This error is appeared on nearly all major browsers like Mozilla Firefox, Google Chrome, Microsoft Edge, etc and operating systems including Microsoft Windows OS, Linux, MacOS, etc, including servers. Error Code sec_error_reused_issuer_and_serial is usually appeared when you try to access/visit certain websites in your browser like Firefox in Windows 10/8/7 computer.

The error is appeared with title ‘Secure Connection Failed’ and message saying ‘An error occurred during a connection to. You have received an invalid certificate. Please contact the server administrator or email correspondent and give them the following information’ along with ‘Error Code sec_error_reused_issuer_and_serial’ error. This error indicates that a certificate that is already present on system is being reused by another server/IP.

The possible reasons behind this warning can be the issue from you’re your end and/or some issue with server end. It might possible there is some issue in your browser, internet connection, interference of conflicting software, issues with drivers, and other issues in your Windows computer that is causing Error Code sec_error_reused_issuer_and_serial.

This issue can be occurred due to corrupted Certificate Manager of the browser, corrupted browser cache, interference of third-party antivirus/firewall program installed in computer, issue with your network/internet connection, and other Windows issues. It is possible to fix the issue with our instructions. Let’s go for the solution.

How to fix Error Code sec_error_reused_issuer_and_serial Windows 10?

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Method 2: Try another browser

It might possible this error is limited to some browser or browser you are using to the site that is causing error. You can try a different browser in your Windows computer in order to fix the issue. If you are facing this error on Google Chrome browser, then you can try a another browser like Firefox, IE and other browsers and check if you can access the website properly that was giving error.

Method 3: Delete the problematic Certificate from the application/browser

This issue can be occurred if a certificate is already having an exception in browser or application’s database and similar certificate is served by a website, then the application or browser may deliver this error. You can delete the old exception for the certificate in application or browser’s certificate manager in order to fix the issue.

Delete the problematic certificate in Firefox:

Step 1: Open ‘Mozilla Firefox’ browser in Windows PC and click ‘Menu’ and select ‘Settings’

Step 2: Go to ‘Privacy and Security’ tab, scroll down to ‘Certificates’ section, click ‘View Certificates’ button

Step 3: Go to ‘Server’ tab, check if the problematic certificate is shown. You may find it by IP address or DNS name

Step 4: If so, delete the certificate and head to ‘Authorities’ tab, and click ‘Delete’ or ‘Distrust’ to ‘CA’ related to problematic certificate.

Step 5: Confirm to complete the deletion action and close the Firefox window. Once done, restart your computer and check if the issue is resolved.

Delete the problematic certificate for an Email Application:

Step 1: Close the problematic email application like Outlook

Step 2: Click ‘Windows’, search and open ‘Internet Options’ or ‘Internet Properties’ window

Step 3: Go to ‘Content’ tab and click ‘Certificate’ button, select the certificate from problematic websites and click ‘Remove’, and then save the changes. Once done, restart your computer and check if Email Client Error Code sec_error_reused_issuer_and_serial is resolved.

Delete the certificate file from AppData folder of browser:

Step 1: Close the browser like Firefox that is causing error. Now, press ‘Windows + R’ keys on keyboard, type ‘%appdata%\Mozilla\Firefox\Profiles’ in ‘Run’ window and hit ‘Ok’ button to open the path

Step 2: Open ‘Profile’ folder and delete ‘cert9.db’ file. Some old Firefox Installations may show cert8.db so delete it.

Step 3: Now, delete ‘Cert_override.txt’ file and launch the browser and check if the issue is resolved.

Method 4: Clear Browser Cache

One possible way to fix the issue is to clear browser cache in computer.

For Firefox:

Step 1: Open ‘Mozilla Firefox’ browser and click ‘Menu’ and select ‘Settings > Privacy & Security’

Step 2: Click ‘Cookies and Sites Data’ option and click ‘Clear Data’ button, check ‘Cached Web Content’ and click ‘Clear Data’ button. Once done, restart your browser and check if the issue is resolved.

For Chrome:

Step 1: Open ‘Google Chrome’ browser and press ‘CTRL + SHIFT + DELETE’ keys on keyboard to open ‘Clear browsing data’ tab/page

Step 2: Select ‘All Times’ from ‘Startup Type’ dropdown, select the checkboxes relating to ‘Cookies’ and ‘Cache’, and hit ‘Clear Data’ button and confirm it. Once done, restart your browser and check if the issue is resolved.

Method 5: Restore the browser to factory defaults

Resetting your browser like Firefox to factory default can resolve the issue.

Reset Firefox:

Step 1: Open ‘Firefox’ browser and click ‘menu’ and select ‘Help > More Troubleshooting Information’

Step 2: Click ‘Refresh Firefox’ and confirm it and once finished, restart your browser and check if it works for you.

Reset chrome:

Step 1: Open ‘Google Chrome’ browser and click ‘Three-Dots’ icon at top-right corner and select ‘Settings > Advanced > Reset and Cleanup’

Step 2: Click ‘Restore settings to their original defaults’ option and confirm to restore settings. Once done, restart your browser and check if the issue is resolved.

Method 6: Disable SSL Filtering of Security Software or uninstall it

This issue can be occurred due to interference of enabled SSL Filtering of security software installed in your computer. You can fix the issue by disabling SSL filtering of security software or uninstall it.

Step 1: Find and right-click on your Security software like ESET in System Tray, and select ‘Advanced Setup’ and go to ‘Web and Email’ tab

Step 2: Expand ‘SSL/TLS’ and toggle the switch for ‘Enable SSL/TLS protocol filtering’ to OFF position. For some antivirus, you might have to deselect ‘Enable HTTPS Scanning or disable control URLs’

Step 3: Apply your changes and then check if the issue is resolved.

Uninstall your security Software:

If the issue is still persist, you can uninstall your security software in computer in order to fix.

Step 1: Open ‘Control Panel’ in Windows PC via Windows Search Box and go to ‘Uninstall a Programs > Programs & Features’

Step 2: Find and right-click on your security software, and select ‘Uninstall’ to uninstall it and after that, restart your computer and check if the issue is resolved.

Method 7: Try another network

This issue can also be occurred due to some issue with your network/internet connection. You can restart/reset your network device like router in order to fix the issue. Also, you can try another network/internet connection or WiFi network in your computer and check if it works for you.

How to fix Error Code sec_error_reused_issuer_and_serial? [Server-relating issue]

This issue can be occurred due to server problem. If you investigate there is server issue that is causing the issue, then you can follow the below guidelines to fix.

Step 1: Change IP address of problematic server

Step 2: If you are using GitLab runner application, check if downgrading its version solves the issue

Step 3: Make sure Domain Locking of problematic website is not causing the issue if the issue has occurred while setting up SSL in Cloudflare.

Step 4: If any of your servers are using iDRAC, then check if updating or downgrading its firmware solves the issue.

Step 5: Check if installing MR4 clears the issue if you are using Sophos protection.

Step 6: If you are unable to login into server, check you can log into server using SSH.

Step 7: If the problematic server is using outdated infrastructure, check if using an older version of JAVA resolves the issue.

Step 8: Check if remaining problematic server resolves the issues

Step 9: You can also check if re-adding the certificate to server resolves the issue.

Conclusion

I am sure this post helped you on How to fix Error Code sec_error_reused_issuer_and_serial Windows 10 with several easy steps/methods. You can read & follow our instructions to do so. That’s all. For any suggestions or queries, please write on comment box below.