php file_get_contents HTTP request failed! HTTP/1.1 401 on asp

[mwmills]

I'm trying get a content HTML from a page in asp with \[code\]file_get_contents\[/code\].When load page with browser, it works, no problem.To print status response I get 200 ok.\[code\]<%Response.Write(Response.Status);%>\[/code\]But when I use \[code\]file_get_contents\[/code\], I get the error \[code\] HTTP request failed! HTTP/1.1 401 Unauthorized \[/code\]if the cause from problem in firewall, is posible solved??other can be cause from error?