SSL: Firefox SSL error sec_error_unknown_issuer

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Posted on February 04, 2009

Error: sec_error_unknown_issuer

I found this error was mostly ocurring under firefox version 3 and the root cert was listed within the browser settings.

To resolve this error you must install the root cert on the server. This seems to happen mostly with PositiveSSL’s from Comodo.

Root cert needed: PositiveSSLca.crt from

Positive SSL installation

Mozilla Reference