> I strongly suspect the identification page to be a 
> form-based page, that is, a page with a username and 
> password textfields embedded.
> These pages can not be downloaded using basic 
> authentication, but you can capture the login page 
> through:
> Add URL/Capture URL
> 
> This is not very simple to do, as you have to 
> temporary change your browser's proxy settings, but 
> the capture tool should give you a working URL (see in 
> the Documentation, interface)
> 
>