Well, I've still got nothing but "403 Forbidden" in place of my webUI, and I am unable to actually log into the firewall whatsoever. It just doesn't accept my credentials/ssh keys anymore. Until I spend 5 hrs driving out to reload the box, about the only thing I can actually do is ping it. The good news is that it is still passing traffic, and I am able to remote in to the network behind it, so that removes a lot of the urgency from the task. Might have some time next weekend, I guess.
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