RS 2000, Forms Authentication, Argument Exception Adding Auth Cookie To The Web Request For Graph

Hello, I have run into a strange problem with RS 2000. I have a base class that will call a reporting server web service, render a report to pdf, then write the report output to the stream. This has worked fine for me for reports.

However, when I render a graph to pdf, I get the following exception:

[ArgumentException: cookie.Domain]

System.Net.CookieContainer.Add(Cookie cookie) +583
Learning.Common.Reporting.ReportServerProxy.GetWebRequest(Uri uri)

...

I only get this exception in our staging environment, not locally.

Here is a code snippet from the ReportServerProxy class, but it is pretty textbook according to the MSDN samples..

public class ReportServerProxy : ReportingService {
protected override WebRequest GetWebRequest(Uri uri) {
HttpWebRequest request;
request = (HttpWebRequest)HttpWebRequest.Create(uri);
// Create a cookie jar to hold the request cookie
CookieContainer cookieJar = new CookieContainer();
request.CookieContainer = cookieJar;
Cookie authCookie = AuthCookie;
// if the client already has an auth cookie
// place it in the request's cookie container
if (authCookie != null){
request.CookieContainer.Add(authCookie);
}
...

}


As I said, I can run reports one after another without issue, graphs are causing me problems.