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Apologies in advance if this comes off like a totally boneheaded question! Our situation is that we currently have a PIX 501 firewall, and we're upgrading to an ASA 5505 because the PIX is getting a little long in the tooth and coming up on end-of-l...
Try leaving the username blank and then entering your regular password. I'm working on getting an ASA 5505 set up via the ASDM, and that's what it takes to get me back in for another attempt. Hope that helps you out, though!