Firefox – Error code: sec_error_reused_issuer_and_serial

Most likely it is due to a conflict in self signed certificate that you added as exception in Firefox.

Close Firefox & delete C:\Documents and Settings\<userAccount>\Application Data\Mozilla\Firefox\Profiles\<userProfile>\xxxxx. This will basically remove all the exceptions that you have added earlier.

Note: At times I had to delete the cert_override.txt file too from the same folder to get things working.

Open Firefox again, you should be good


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