Default Admin/Netgear1 Logon Doesnt Work (#8463338)

The security warning in IE (we've both mentioned it) is pretty obvious.
iirc, Part of the address bar turns pink and you get two large shields appearing on the main screen.
One shield is Red with an 'X', the other is Green with a tick.
You're prompted with a question like "the security certificate doesn't match blah blah blah. Do you want to close this web page?"
Most people click yes without reading the question.
In this case you have to click 'NO, I want to proceed to the web page'

Firefox does something similar but it's not as "in your face" as IE.

For IE's security settings: Open IE, click Tools, Internet Options, Security, Local Intranet.
Security level should be medium-low.
You could also enter the IP address of the NAS in the trusted sites section. I haven't but it may help.

In Firefox settings are found under Tools, Options, Security & also the advanced tab.
On the advanced tab click view certificates, Servers, Add exception.
In that dialogue box, enter the IP address of the NAS and click "get certificate"