Web : Firefox error code sec_error_reused_issuer_and_serial

By | March 15, 2015

You may ran into the following issue with Firefox browsing a SSL Web site using self generated certificate :


The cause is that the self generated certificate of the site you are browsing have the same serial number of a previously stored certificate (another Web site you already visited and manually added an exception for).

To resolve this matter, you need to delete the Firefox certificate database file. Simply delete the “cert8.db” file under your profile under that path :