PHP/Curl and 401 errors

I'm trying to logon to a site through https, punch in the user name and password, sent my post data and then retrieve the results of the site. Whenever I do this however, I'm getting back the error: HTTP 401.2 - Unauthorized: Logon failed due to server configuration Internet Information Services --- Technical Information (for support personnel) Background: This is usually caused by a server-side script not sending the proper WWW-Authenticate header field. Using Active Server Pages scripting this is done by using the AddHeader method of the Response object to request that the client use a certain authentication method to access the resource. More information: Microsoft Support The page I'm posting to is in ASP, and the server is obviously a windows machine. Is there some sort of special header I need to pass on with CURL to get something like this to work? This is what the curl portion of the script looks like: $post="&date=4/27/01&type=FILE" $f=curl_init(); curl_setopt($f,CURLOPT_URL,'https://www.somesite.asp/post.asp'); curl_setopt($f,CURLOPT_USERPWD,"myusername:mypassword"); curl_setopt($f,CURLOPT_POSTFIELDS,$post); curl_setopt($f,CURLOPT_POST,1); curl_setopt($f,CURLOPT_RETURNTRANSFER,1); $info=curl_exec($f); curl_close($f); I don't know a whole lot about curl, so any help with this would be GREATLY appreciated. Thanks