“Secure Connection Failed” using Firefox to administer NetScaler

When administering different Citrix NetScaler appliances you can run into the below error message.

“Secure Connection Failed” and to be more specific “Error code: sec_error_reused_issuer_and_serial” which basically means that the serial number found within the certificate has already been trusted by you. This makes sense because NetScaler uses a self-signed certificate which is the same across all NetScaler appliances.



Within Firefox, go to Options, Advanced, Certificates. Click ‘’View Certificates’, hit the ‘Servers’ tab.

Look for the Citrix ANG\default certificate, delete the certificate.


A solution would be not to permanently store the certificate exception by deselecting the below option.


More info: https://support.mozilla.org/en-US/kb/Certificate%20contains%20the%20same%20serial%20number%20as%20another%20certificate


About Henny Louwers
I work as a Consultant specialized in Application Delivery, Virtualization of Servers, Desktops and Apps.

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