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HTTPWebRequest returns "(407) Proxy Authentication Required" in  PreAuthenticate

Posted on 2011-03-25
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3,331 Views
Last Modified: 2012-05-11
Hi All,
We have an already deployed .NET app that PreAuthenticates HttpWebRequest as below:
 
webRequest = (HttpWebRequest)HttpWebRequest.Create(address);
webRequest.Credentials = myCreds;
webRequest.PreAuthenticate = true;
webRequest.Method = "HEAD";
webRequest.Timeout = 10000;
webRequest.AllowWriteStreamBuffering = true;	
#region Proxy settings
WebProxy proxy = new WebProxy(proxyAddress, proxyPort);
proxy.Credentials = new NetworkCredential(cm.FirewallUser, cm.FirewallPassword);
webRequest.Proxy = proxy;
proxy.Credentials = NetworkCredential("domain\\user", "password")
webRequest.Proxy = proxy;
webResponse = (HttpWebResponse)webRequest.GetResponse();

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as you can see I specify the proxy user as "domain\\user" since the proxy server does active directory authentication. However, preAuthentication fails with this error:

The remote server returned an error: (407) Proxy Authentication Required

I know the NetworkCredential(username, password, domain) constructor should be used to properly specify the domain name. But, the application is already deployed and I cannot make any changes to it. Does anyone know why supplying the domain name with the user name (i.e. domain\user) does not work? the customer reported that the username/password is not being supply to the proxy server which is strange since the application is setting the proxy credentials

any help?
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Question by:hamid441
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3 Comments
 
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Expert Comment

by:käµfm³d 👽
ID: 35220766
The constructor for NetworkCredential is overloaded to take three parameters:
new NetworkCredential("username", "password", "domain");

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LVL 75

Expert Comment

by:käµfm³d 👽
ID: 35220768
Nevermind...   I missed that part in your post.
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Accepted Solution

by:
käµfm³d   👽 earned 500 total points
ID: 35220818
Looking at that assembly in Reflector, it appears as though username is, at some point, concatenated with the value of domain (separated by a \ ). Even if you were to leave the domain off, or set it to empty string, the "\" is still being inserted, so what you would end up with internally is something like:

    \username

which AD doesn't like.
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