Newbie help with unexpected Roku box login requirement.

Hi

I'm in the final phases of building a Roku channel - my first foray

I built and housed content, images, rebuilt and uploaded xml - got my Roku box in Dev mode, and have repackaged
my app into a zip ready for deployment.

I'm running Win7

However when I open my browser and point it at my Roku's IP address to deply the application zip file, I get a
"Windows Security" login dialogue that says

"The server xx.x.x.x is asking for your user name and password.
The server reports that it is from rokudev"

I can't get past it - I have no idea which login/password pair it is asking for - I've tried everything I can
(Roku passwords, Windows User Passwords - the Roku DevID/password.)

Does anyone know what the Roku box is asking for???? I suspect it might be some kind of network anomaly.

Thanks in advance!!