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

Èròjà atẹ̀lélànà yii ni a ti fi pamọ́ fọ́jọ́ pípẹ́. Jọ̀wọ́ béèrè ìbéèrè titun bí o bá nílò ìrànwọ́.

SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED

  • 2 àwọn èsì
  • 1 ní ìṣòro yìí
  • 1 view
  • Èsì tí ó kẹ́hìn lọ́wọ́ Shocking

more options

I have imported our AD Enterprise Certificate into Firefox but it continues to give the error;

"Insecure connection: Invalid security certificate" to the web certificates we issue.

"The certificate is not trusted because it was signed using a signature algorithm that was disabled because that algorithm is not secure." "Error code: SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED" IE and Chrome do not give any errors regarding these same certificates. How can I find out what "CERT_SIGNATURE_ALGORITHM" is causing the error?

I have imported our AD Enterprise Certificate into Firefox but it continues to give the error; "Insecure connection: Invalid security certificate" to the web certificates we issue. "The certificate is not trusted because it was signed using a signature algorithm that was disabled because that algorithm is not secure." "Error code: SEC_ERROR_CERT_SIGNATURE_ALGORITHM_DISABLED" IE and Chrome do not give any errors regarding these same certificates. How can I find out what "CERT_SIGNATURE_ALGORITHM" is causing the error?

All Replies (2)

more options

What are the connection details in Google Chrome if you click the padlock in the location/address bar?

The Page Info window shows this for the Mozilla Support website.

  • Connection Encrypted (TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA, 128 bit keys, TLS 1.2)
more options

Google displays the Secure Lock.

I have uploaded images of the Certificate details from IE.

I think it may be the that the “Thumbprint Algorithm” is sha1?