我有一个 ASP.NET (v2.0) Web 应用程序，它使用对 SQL Server Reporting Services 208 R2 实例的引用（使用 ReportService2010.asmx 服务端点）。Web 应用程序托管在 ServerA 上，而 Reporting Services 实例托管在 ServerB 上。ServerA 正在运行 Windows Server 2003 (IIS6)，ServerB 正在运行 Windows Server 2008 R2。
Web 应用程序配置为使用 Windows 身份验证并打开模拟。当我在 ServerA 上本地运行 Web 应用程序（使用远程桌面连接）时，它可以工作，但是当我从桌面计算机（Windows XP）运行时，我收到以下错误：
“/MyWebApp”应用程序中的服务器错误。
请求失败，HTTP 状态为 401：未授权。说明：执行当前 Web 请求期间发生未处理的异常。请查看堆栈跟踪以获取有关错误及其源自代码的位置的更多信息。
异常详细信息：System.Net.WebException：请求失败，HTTP 状态 401：未授权。
源错误：
在执行当前 Web 请求期间生成了未处理的异常。可以使用下面的异常堆栈跟踪来识别有关异常起源和位置的信息。
堆栈跟踪：
[WebException：请求失败，HTTP 状态 401：未授权。] System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse（SoapClientMessage 消息，WebResponse 响应，流 responseStream，Boolean asyncCall）+431289
System.Web.Services.Protocols.SoapHttpClientProtocol。 Invoke(String methodName, Object[] parameters) +204
ReportingServices.ReportingService2010.ListChildren(String ItemPath, Boolean Recursive) +81 Default.LoadReports() +54
Default.Page_Load(Object sender, EventArgs e) +224
System.Web.Util .CalliHelper.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e) +14
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +35 System.Web.UI.Control.OnLoad(EventArgs e) +99
System.Web.UI.Control.LoadRecursive() +50
System.Web.UI.Page.ProcessRequestMain（布尔型 includeStagesBeforeAsyncPoint，布尔型 includeStagesAfterAsyncPoint）+627
版本信息：Microsoft .NET Framework 版本：2.0.50727.3634；ASP.NET 版本：2.0.50727.3634
加载报告方法：
private void LoadReports()
{
ReportingService2010 rService = new ReportingService2010();
rService.Credentials = System.Net.CredentialCache.DefaultCredentials;
CatalogItem[] catalogItems;
catalogItems = rService.ListChildren(ReportPath, true);
BuildTree(catalogItems);
}
ServerA 上的应用程序事件日志包含以下附加详细信息：
Event Type: Warning
Event Source: ASP.NET 2.0.50727.0
Event Category: Web Event
Event ID: 1309
Date: 28/06/2012
Time: 11:25:16
User: N/A
Computer: ServerA
Description:
Event code: 3005
Event message: An unhandled exception has occurred.
Event time: 28/06/2012 11:25:16
Event time (UTC): 28/06/2012 10:25:16
Event ID: 11f6bec3e91045229f4e34a5d2de78e9
Event sequence: 4
Event occurrence: 1
Event detail code: 0
Application information:
Application domain: /LM/W3SVC/1/Root/MyWebApp-1-129853527126453497
Trust level: Full
Application Virtual Path: /MyWebApp
Application Path: c:\inetpub\wwwroot\MyWebApp\
Machine name: ServerA
Process information:
Process ID: 1180
Process name: w3wp.exe
Account name: NT AUTHORITY\NETWORK SERVICE
Exception information:
Exception type: WebException
Exception message: The request failed with HTTP status 401: Unauthorized.
Request information:
Request URL: http://ServerA/MyWebApp/Default.aspx
Request path: /MyWebApp/Default.aspx
User host address: 192.168.100.130
User: DOMAIN\mylogin
Is authenticated: True
Authentication Type: Negotiate
Thread account name: NT AUTHORITY\NETWORK SERVICE
Thread information:
Thread ID: 1
Thread account name: NT AUTHORITY\NETWORK SERVICE
Is impersonating: False
Stack trace:
at System.Web.Services.Protocols.SoapHttpClientProtocol.ReadResponse(SoapClientMessage message, WebResponse response, Stream responseStream, Boolean asyncCall)
at System.Web.Services.Protocols.SoapHttpClientProtocol.Invoke(String methodName, Object[] parameters)
at ReportingServices.ReportingService2010.ListChildren(String ItemPath, Boolean Recursive)
at Default.LoadReports()
at Default.Page_Load(Object sender, EventArgs e)
at System.Web.Util.CalliHe.EventArgFunctionCaller(IntPtr fp, Object o, Object t, EventArgs e)
at System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e)
at System.Web.UI.Control.OnLoad(EventArgs e)
at System.Web.UI.Control.LoadRecursive()
at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)