401 Unauthorized Access When Calling Report Server From ASP.NET Application

I receive the following error when i call report server web service from an asp.net application:

"The request failed with HTTP status 401: Unauthorized."



Here are the IIS logs on the reporting services server. When i open IE and browse to the web service i provide my user credentials and i can access the web service just fine. However when i call the web service via my asp.net application it looks like my credentials are not being passed??

Browsing web services via internet explorer.

2008-02-11 21:26:13 W3SVC1836052065 HQSQLDEV1 10.69.21.140 GET /Reports/images/16fold.gif - 8080 triwestdbloom 10.69.21.140 HTTP/1.1 Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2;+WOW64;+SV1;+.NET+CLR+2.0.50727;+.NET+CLR+1.1.4322) 10.69.21.140:8080 200 0 0 15

Call from ASP.NET App

2008-02-11 21:26:13 W3SVC1836052065 HQSQLDEV1 10.69.21.140 GET /Reports/images/16fold.gif - 8080 - 10.69.21.140 HTTP/1.1 Mozilla/4.0+(compatible;+MSIE+6.0;+Windows+NT+5.2;+WOW64;+SV1;+.NET+CLR+2.0.50727;+.NET+CLR+1.1.4322) 10.69.21.140:8080 401 1 0 0

Here is my code:


RSWebService.ReportingService rs = new RSWebService.ReportingService();

rs.Credentials = new System.Net.NetworkCredential(@"triwestdbloom",

"blah", "triwest");



//rs.PreAuthenticate = true;

//Get all folders

RSWebService.CatalogItem[] allItems = rs.ListChildren("/", false);

//Get only folders not hidden to the user.

List<RSWebService.CatalogItem> visibleItems = new List<RSWebService.CatalogItem>();

foreach (RSWebService.CatalogItem item in allItems)

{

Response.Write(item.Name.ToString());

}

Any ideas?