不支持指定的方法，iis 7.5 win 2008 r2

Question

我有一个代码，在 iis7 windows 2008 32 位上工作得很好，但在 iis7.5 上我时不时地遇到以下错误。看起来这是由于客户端断开连接造成的，但在旧设置中从未出现过此错误，并且存在客户端断开连接错误。它通常发生在简单的发布请求中。我不明白为什么 system.drawing 会抛出错误。尽管其中一些帖子请求是多部分文件/图像上传，但大多数都是简单的表单帖子。

有人见过类似的事情吗？

 System.Web.HttpUnhandledException: Exception of type 'System.Web.HttpUnhandledException' was thrown. ---> System.Web.HttpException: An error occurred while communicating with the remote host. The error code is 0x800703E3. ---> System.NotSupportedException: Specified method is not supported.
   at System.Web.HttpResponseStream.get_Position()
   at System.Drawing.UnsafeNativeMethods.ComStreamFromDataStream.Seek(Int64 offset, Int32 origin)
   --- End of inner exception stack trace ---
   at System.Web.Hosting.IIS7WorkerRequest.RaiseCommunicationError(Int32 result, Boolean throwOnDisconnect)
   at System.Web.Hosting.IIS7WorkerRequest.ReadEntityCoreSync(Byte[] buffer, Int32 offset, Int32 size)
   at System.Web.HttpRequest.GetEntireRawContent()
   at System.Web.HttpRequest.FillInFormCollection()
   at System.Web.HttpRequest.get_Form()
   at System.Web.HttpRequest.get_HasForm()
   at System.Web.UI.Page.GetCollectionBasedOnMethod(Boolean dontReturnNull)
   at System.Web.UI.Page.DeterminePostBackMode()
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   --- End of inner exception stack trace ---
   at System.Web.UI.Page.HandleError(Exception e)
   at System.Web.UI.Page.ProcessRequestMain(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest(Boolean includeStagesBeforeAsyncPoint, Boolean includeStagesAfterAsyncPoint)
   at System.Web.UI.Page.ProcessRequest()
   at System.Web.UI.Page.ProcessRequest(HttpContext context)
   at ASP.mobile_chat_aspx.ProcessRequest(HttpContext context)
   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()
  at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)