This site will have limited functionality while we undergo maintenance to improve your experience. If an article doesn't solve your issue and you want to ask a question, we have our support community waiting to help you at @FirefoxSupport on Twitter and/r/firefox on Reddit.

Search Support

Avoid support scams. We will never ask you to call or text a phone number or share personal information. Please report suspicious activity using the “Report Abuse” option.

Learn More

Hierdie gesprek is in die argief. Vra asseblief 'n nuwe vraag as jy hulp nodig het.

How to fix Error code: SEC_ERROR_REUSED_ISSUER_AND_SERIAL

  • 2 antwoorde
  • 1 het hierdie probleem
  • 4 views
  • Laaste antwoord deur Fran237

more options

I am getting this error on several sites, "Your certificate contains the same serial number as another certificate issued by the certificate authority. Please get a new certificate containing a unique serial number. Error code: SEC_ERROR_REUSED_ISSUER_AND_SERIAL". I see this has been an issue for many years but have not been able to find an answer. I have never set any certificate exemptions. Chrome works fine with the problematic sites so I don't think there is an issue with my router. Thanks for any help, I can't wait to stop using chrome.

I am getting this error on several sites, "Your certificate contains the same serial number as another certificate issued by the certificate authority. Please get a new certificate containing a unique serial number. Error code: SEC_ERROR_REUSED_ISSUER_AND_SERIAL". I see this has been an issue for many years but have not been able to find an answer. I have never set any certificate exemptions. Chrome works fine with the problematic sites so I don't think there is an issue with my router. Thanks for any help, I can't wait to stop using chrome.

All Replies (2)

more options

You can try to rename/remove the cert8.db file in the Firefox profile folder with Firefox closed.

You can use the button on the "Help -> Troubleshooting Information" (about:support) page to go to the current Firefox profile folder or use the about:profiles page.

more options

Thanks for replying. I have tried removing that and another cert... file, restarting and nothing changes.