【发布时间】：2013-10-17 17:29:21
【问题描述】：
当我创建新的 asp.net webform .net 4.0 并配置 AuthConfig.cs 时，我使用的是 Microsoft.AspNet.Membership.OpenAuth：
OpenAuth.AuthenticationClients.AddFacebook(
appId: "my appId",
appSecret: "my appSecret");
在 Facebook 应用配置中： 使用 Facebook 登录的网站：http://www.tindep.com
但是当我用 facebook 登录时出现错误：
Server Error in '/' Application.
The remote server returned an error: (400) Bad Request.
Description: An unhandled exception occurred during the execution of the current web request. Please review the stack trace for more information about the error and where it originated in the code.
Exception Details: System.Net.WebException: The remote server returned an error: (400) Bad Request.
Source Error:
An unhandled exception was generated during the execution of the current web request. Information regarding the origin and location of the exception can be identified using the exception stack trace below.
Stack Trace:
[WebException: The remote server returned an error: (400) Bad Request.]
System.Net.WebClient.DownloadDataInternal(Uri address, WebRequest& request) +283
System.Net.WebClient.DownloadString(Uri address) +100
DotNetOpenAuth.AspNet.Clients.FacebookClient.QueryAccessToken(Uri returnUrl, String authorizationCode) +235
DotNetOpenAuth.AspNet.Clients.OAuth2Client.VerifyAuthentication(HttpContextBase context, Uri returnPageUrl) +142
DotNetOpenAuth.AspNet.OpenAuthSecurityManager.VerifyAuthentication(String returnUrl) +239
Microsoft.AspNet.Membership.OpenAuth.OpenAuthManager.VerifyAuthentication(HttpContextBase context, String returnUrl) +116
Microsoft.AspNet.Membership.OpenAuth.OpenAuth.VerifyAuthentication(String returnUrl) +82
EVNSoft.Website.Account.RegisterExternalLogin.ProcessProviderResult() +205
EVNSoft.Website.Account.RegisterExternalLogin.Page_Load() +24
System.Web.Util.CalliEventHandlerDelegateProxy.Callback(Object sender, EventArgs e) +9808229
System.Web.UI.Control.OnLoad(EventArgs e) +92
System.Web.UI.Control.LoadRecursive() +54
System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint) +772
Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.18055
虽然谷歌、推特、msdn登录成功（查看tindep.com/Account/Login.aspx） 这只是托管错误（tindep.com/Account/Login.aspx）。 localhost:57846/Account/Login.aspx 登录facebook成功。
请帮我找出原因。
非常感谢！
【问题讨论】：
-
也在寻找这个解决方案。