On Wed, 17 Aug 2005, Raluca Oprean wrote:

> HTTP 407 Proxy Authentication Required - The ISA Server requires
> authorization to fulfill the request. Access to the Web Proxy service is
> denied. (12209) Internet Security and Acceleration Server

Check the response headers, they contain the info you need. Like what
authentication methods it accepts.

-- 
  Commercial curl and libcurl Technical Support: http://haxx.se/curl.html