无法使用EWS托管API从Exchange Server 2010保存附件

Question

尝试使用EWS托管API从Exchange Server 2010读取附件时出现以下错误。

请求失败。无法从传输连接读取数据：远程主机强制关闭现有连接。

请在下面找到我的代码。在fileAttachment.Load

获取错误

ExchangeService service = new ExchangeService(ExchangeVersion.Exchange2010_SP2);

        try
        {
            service.Url = new Uri(ConfigurationManager.AppSettings["EWS"]);

            service.Credentials = new NetworkCredential("XXXX", "XXX", "XXX");

            FindItemsResults<Item> findResults = service.FindItems(WellKnownFolderName.Inbox, new ItemView(100));

            EmailMessage message;

            foreach (Item item in findResults.Items)
            {
                message = EmailMessage.Bind(service, item.Id, new PropertySet(BasePropertySet.IdOnly, ItemSchema.Attachments));

                message.Load();

                if (message.HasAttachments)
                {
                    foreach (Attachment attachment in message.Attachments)
                    {
                        if (attachment is FileAttachment)
                        {
                            FileAttachment fileAttachment = attachment as FileAttachment;

                            fileAttachment.Load(@"C:\Mohan\Mail\" + fileAttachment.Name);
                        }
                    }
                }
            }           
        }
        catch (Exception ex)
        {
            Console.WriteLine(ex.Message);
        }