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You may see the following error message when attempting to access a router's configuration page: ;:'''Your certificate contains the same serial number as another certificate issued by the certificate authority. Please get a new certificate containing a unique serial number. (Error code: sec_error_reused_issuer_and_serial)''' This article describes the cause of this problem and how to work around it. = Cause = Older routers will sometimes improperly regenerate their security certificates instead of keeping the same one for the life of the device. If you have added a permanent security exception for your router, and if this regeneration is done improperly, Firefox will detect the change as a possible attack. = Solution = The long term solution is to contact your hardware vendor and see if updates are available for your device which fix this problem. = Workaround = If you are confident that no attack has occurred, you can work around the problem by deleting your old exception and using temporary exceptions for subsequent visits to the page: To delete your old exception: # [[T:optionspreferences]] # Select the {menu Advanced} panel. # Click on the {menu Encryption} tab. # Click {button View Certificates} to open the Certificate Manager window. # In the Certificate Manager window click on the {menu Servers} tab. # Find the item that corresponds to the site that generates the error. Note the Certificate Authority (CA) for that server - the CA name appears above the site name. <br/> <br/> [[Image:cffcf8a9e5e507cd1fb8eb64de821ad3-1257730614-636-1.png]] <br/> # Click on the server certificate that corresponds to the site that generates the error and press {button Delete...}. # Click {button OK} when prompted to delete the exception. # Click on the {menu Authorities} tab. # Click on the item that corresponds to the CA that you noted earlier and then press {button Delete...}. # Click {button OK} when prompted to delete the exception. # Click {button OK} close the Certificate Manager window. # [[T:closeOptionsPreferences]]. To add a temporary exception to allow access to the page: {for fx3} # When you go to the page, you will be presented with an error. Click on the '''Or you can add an exception...''' link at the bottom of the error. # Click on {button Add Exception...} to open the Add Security Exception window. # Click {button Get Certificate} to fill in the Certificate Status section of the Add Security Exception window. # Click to '''un-check''' the '''Permanently store this exception''' item. # Click {button Confirm Security Exception} to close the Add Security Exception window. {/for} {for fx35} # When you go to the page, you will be presented with an error. Click on the '''I Understand the Risks''' link at the bottom of the error, then click {button Add Exception...}. # Click on {button Add Exception...} to open the Add Security Exception window. # Click {button Get Certificate} to fill in the Certificate Status section of the Add Security Exception window. # Click to '''un-check''' the '''Permanently store this exception''' item. # Click {button Confirm Security Exception} to close the Add Security Exception window. {/for} The page will load.