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我的网站托管在 azure 上。我使用 SSRS 报告查看器控件来展示我的报告。这样做时，我遇到了一个问题。

每当我将大量数据导出为 Excel/PDF/Word/Tiff 时，它都会突然抛出以下错误：

Error: Microsoft.Reporting.WebForms.ReportServerException: The remote server returned an error: (401) Unauthorized. ---> System.Net.WebException: The remote server returned an error: (401) Unauthorized.

   at System.Net.HttpWebRequest.EndGetResponse(IAsyncResult asyncResult)

   at Microsoft.Reporting.WebForms.SoapReportExecutionService.ServerUrlRequest(AbortState abortState, String url, Stream outputStream, String& mimeType, String& fileNameExtension)

   --- End of inner exception stack trace ---

   at Microsoft.Reporting.WebForms.SoapReportExecutionService.ServerUrlRequest(AbortState abortState, String url, Stream outputStream, String& mimeType, String& fileNameExtension)

   at Microsoft.Reporting.WebForms.SoapReportExecutionService.Render(AbortState abortState, String reportPath, String executionId, String historyId, String format, XmlNodeList deviceInfo, NameValueCollection urlAccessParameters, Stream reportStream, String& mimeType, String& fileNameExtension)

   at Microsoft.Reporting.WebForms.ServerReport.InternalRender(Boolean isAbortable, String format, String deviceInfo, NameValueCollection urlAccessParameters, Stream reportStream, String& mimeType, String& fileNameExtension)

   at Microsoft.Reporting.WebForms.ServerReport.Render(String format, String deviceInfo, NameValueCollection urlAccessParameters, String& mimeType, String& fileNameExtension)

   at Microsoft.Reporting.WebForms.ServerModeSession.RenderReport(String format, Boolean allowInternalRenderers, String deviceInfo, NameValueCollection additionalParams, Boolean cacheSecondaryStreamsForHtml, String& mimeType, String& fileExtension)

   at Microsoft.Reporting.WebForms.ExportOperation.PerformOperation(NameValueCollection urlQuery, HttpResponse response)

   at Microsoft.Reporting.WebForms.HttpHandler.ProcessRequest(HttpContext context)

   at System.Web.HttpApplication.CallHandlerExecutionStep.System.Web.HttpApplication.IExecutionStep.Execute()

   at System.Web.HttpApplication.ExecuteStep(IExecutionStep step, Boolean& completedSynchronously)

它在本地（在开发人员机器上）或数据较少时工作。但在 azure 上发布时，它不适用于大型数据集。

任何帮助将不胜感激。

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