Hacking Nus download error 401 not authorized

[scooby74029]

Ok I need an answer to why i am getting the 401 not authorized return from NUS.
I am building a program that retrieves files from Nus and it was working great, but now after working on it for a few hours I keep getting this error.

Does anyone know why and how other programs such as Nusdownloader get by with downloading from the same servers on the same computer?

Thanks to anyone that can help!!!!