Getting Error The remote server returned an error: (401) unauthorized

Hello, I'm trying to access a text file from web site using the code below but I get an error message stating "The remote server returned an error: (401) unauthorized”

If I manually click on the link I can get to the document but I get the error above when trying to access the document via code.

I did make sure that my text document was set up with read write for network services also but still get the error message.

Any ideas what I might be doing wrong?

Using Client = New Net.WebClient()
           Dim Text As String = Client.DownloadString("http://website.com/Testfolder/SystemList.txt")
           MsgBox(Text)
      End Using 

The error I get appears on this line of code

 Client.DownloadString("http://website.com/Testfolder/SystemList.txt")

By the way the link in the code example is not the real link I'm using but meant just for demonstration purposes so it will not work if you try it.