服务器无法处理请求.---> 请求失败，HTTP 状态为 401:未经授权

>我有一个 Web 服务，我编写了它来向 sharepoint 列表添加值我可以在本地计算机上调用网络服务。但是当我将其部署到服务器时，我得到状态 401：未经授权。

谁能告诉我为什么我收到 401 代理错误，我试图在 Web 配置中添加代理标签，但它不起作用。

法典

 [WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
public class Req : System.Web.Services.WebService
{
    [WebMethod]
    public Guid Add()
    {
        string uniqueGuid = string.Empty;
        string[] uniqueID;
    try 
    {           
                CrmList.Lists list = new CrmList.Lists();
                list.PreAuthenticate = true;

                #region getvalue
                list.Credentials = System.Net.CredentialCache.DefaultCredentials;
                XmlNode ndLists = list.GetListCollection();

                //XmlNode test = list.GetList(listName);
                list.Url = "http://site/_vti_bin/Lists.asmx";

                System.Xml.XmlDocument xmlDoc = new System.Xml.XmlDocument();
                string listName = Properties.Settings.Default.ListGuid;
                string viewName = Properties.Settings.Default.ViewGuid; 
                string rowLimit = Properties.Settings.Default.RowLimit;
                System.Xml.XmlElement query = xmlDoc.CreateElement("Query");
                System.Xml.XmlElement viewFields =
                    xmlDoc.CreateElement("ViewFields");
                System.Xml.XmlElement queryOptions =
                    xmlDoc.CreateElement("QueryOptions");

                query.InnerXml = "<OrderBy><FieldRef Name='ID' Ascending='False' /></OrderBy>";
                viewFields.InnerXml = @"<FieldRef Name='ID' />";

                queryOptions.InnerXml = "";

                System.Xml.XmlNode nodeListItems = list.GetListItems(listName, viewName, query, viewFields, rowLimit, queryOptions, "09bdac52-8897-41ee-8a0e-df5fdba617e9");


                #endregion
                string listdata=string.Empty;
                string InvoiceType =string.Empty;
                    listdata= @"<Method ID=""1"" Cmd=""New"">";
                    listdata += @"<Field Name=""ID""></Field>";
                    listdata += @"</Method>";
                    System.Xml.XmlDocument xdoc = new System.Xml.XmlDocument() ;
                    System.Xml.XmlElement xbatch = xdoc.CreateElement("Batch");
                    xbatch.SetAttribute("OnError", "Return");
                    xbatch.InnerXml = listdata;
                    try
                    {
                        list.UpdateListItems(listName, xbatch);
                    }
                    catch (Exception ex)
                    {
                    }

        #region getguid
                    System.Xml.XmlNode currentListValues = list.GetListItems(listName, viewName, query, viewFields, rowLimit, queryOptions,Properties.Settings.Default.WebGuid);
                    string test = string.Empty;
                    XmlDocument xdoc1 = new XmlDocument();
                    XmlNamespaceManager nsmanager = new XmlNamespaceManager(xdoc1.NameTable);
                    nsmanager.AddNamespace("ns1", "http://schemas.microsoft.com/sharepoint/soap");
                    xdoc1.LoadXml(currentListValues.InnerXml);
                    System.Xml.XmlElement root = xdoc1.DocumentElement;
                    List<string> str1 = new List<string>();
                    XmlAttributeCollection attCol;
                    bool IsGuid;
                    foreach (System.Xml.XmlNode listItem in root)
                    {
                        string name = listItem.Name;
                        string value = listItem.OuterXml;
                        attCol = listItem.Attributes;
                        for (int i = 0; i < attCol.Count; i++)
                        {
                            IsGuid = attCol[i].Value.ToString().Contains("{");
                            if (IsGuid)
                            {
                                uniqueID = attCol[i].Value.ToString().Split('{');
                                uniqueGuid = uniqueID[1].ToString().Replace("}", "");
                                //str1.Add(uniqueGuid);
                                break;
                            }

                        }
                        if (!string.IsNullOrEmpty(uniqueGuid))
                        {
                            break;
                        }
                    }
        #endregion

    }
            catch (Exception exc)
            {
                throw ;
            }
    Guid currentItemGuid = new Guid(uniqueGuid);
    return currentItemGuid;
    }
}