Using webproxy object in 2.0 when proxy has been configured to use Active Directory

[J Ames]

Please, if this is the incorrect forum for this question, let me know which
forum is most appropriate. I want to make sure I get visibility with the
proper gurus!

I have a .NET console app that consumes an external web service. It has
passed a userid and password to a web proxy object to pass through our
corporate proxy server and has been running fine for weeks. Our operations
staff has just changed the proxy server so that it now pulls credentials
from our Active Directory, which allows our users to not be prompted at the
firewall when using the Internet since it uses their Windows logon
credentials to authenticate. As such, a connection to an external URL is
handled by the Windows login credentials of the "currently logged in user".
Great for the users, bad for some of our apps! This has caused a few of
our server-based apps to fail, since they are logged in as system accounts.
In my particular case, since my application is doing system-to-system
processing, I have the managed to get my target web service domain on an
exclusion list so it can be accessed without passing ANY proxy credentials.
I have yet to get this to work correctly. Even on my laptop, I can only get
the code to work if I pass the DefaultNetworkC redentials property of the
CredentialCache object. If I take that line out, I get a 407 PRoxy
Authentication Required exception. On the server, it just bombs completely.
I have tried all sorts of things to try to get it to work, but on the server
it continuously fails to get thru the proxy. Here's a code snippet that I
have today which passes no credentials:

public void EstablishConnec tion()

{
// create a container for an HTTP request

req = (HttpWebRequest )WebRequest.Cre ate(GetLogInURL ());
//GetLogInURL=ext ernal address
myProxy = new System.Net.WebP roxy("000.000.0 0.000:11111", true);
myProxy.Credent ials = CredentialCache .DefaultNetwork Credentials; //this
works only on my laptop. before the AD stuff came along I was using
myProxy.Credent ials = new NetworkCredenti als("myid", "mypw") on the server
and it worked

req.Proxy = myProxy;

req.Timeout = 1000000;
// make the HTTP call

HttpWebResponse resp = (HttpWebRespons e)req.GetRespon se(); //fails here

if (resp.StatusCod e == System.Net.Http StatusCode.OK)

{

..... if the code gets here I'm OK. But it fails everytime on the server
and returns a 407 Proxy Authentication Required exception. How can I get
the code to ignore the machine that it's running on and hit our proxy
without passing any credentials?