Sharepoint 2010 （401）使用客户端对象模型时发生未经授权的错误

我正在尝试从sharepoint网站检索文档库列表，这是我的代码，这是一个windows应用程序

public string[] GetDocumentLibraries(ClientContext ctx)
    {
        Collection<string> libraries = new Collection<string>();
        try
        {
            //Getting the site from the SP context
            Web oWebsite = ctx.Web;
            write("INFO: SP site gotten");

            //Getting the list collection from the SP site
            write("INFO: Getting the list collection from the SP site");
            ListCollection listCollect = oWebsite.Lists;
            write("INFO: Loading the list");
            ctx.Load(listCollect);
            write("INFO: Getting the list");
            ctx.ExecuteQuery();
            write("INFO: List Collection size: " + listCollect.Count);

            //Getting the list of document libraries
            foreach (List docLibList in oWebsite.Lists)
            {
                if (docLibList.BaseTemplate == (int)ListTemplateType.DocumentLibrary)
                {
                    write("INFO: Document Library: " + docLibList.Title);
                    libraries.Add(docLibList.Title);
                }
            }
        }
        catch (Exception e)
        {
            write("ERROR: Error getting the list of document libraries, error detail " + e.Message + " " + e.StackTrace);
        }

        return libraries.ToArray();
    }

我相信这些证件是正确的

有什么线索吗

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谢谢，

这个问题看起来很老，但为了其他可能会看到这个问题的人的利益，只有可能的问题会导致这个问题

登录凭据（丢失或不正确）

客户端和服务器之间的代理/防火墙不允许通过进行通信

ERROR: Error getting the list of document libraries, error detail The remote server returned an error: (401) Unauthorized.    at System.Net.HttpWebRequest.GetResponse()
   at Microsoft.SharePoint.Client.SPWebRequestExecutor.Execute()
   at Microsoft.SharePoint.Client.ClientContext.EnsureFormDigest()
   at Microsoft.SharePoint.Client.ClientContext.ExecuteQuery()
   at P_DocumentImporter.DocumentImporter.GetDocumentLibraries(ClientContext ctx)