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Whenever I access my router at firefox complains that the security certificate is invalid. No amount of permanently storing an exception seems to change its mind. Is there something I can do manually to address this?

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Keep in mind that many routers regenerate the HTTPS certificate on reboot. – Adam Byrtek May 23 '11 at 21:55
There is an interesting discussion here - if your router is one of those affected, looks like you'll need to wait for a bug-fix. – fossfreedom May 23 '11 at 21:57

You should try connecting to instead of https://ip-address. You may be able to find the router's DNS name by viewing the certificate details, and looking at the "issued to" "CN" section

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