图像不会上传到网络服务器，但在本地可以

我在服务器上有一些图像，我想将其上传到另一台服务器上，我编写代码将所有图像上传到服务器上，但可以上传到本地，但我不知道有什么问题，因为它无法上传到服务器上

      try
        {
            byte[] content;
            HttpWebRequest request = (HttpWebRequest)WebRequest.Create(url);
            WebResponse response = request.GetResponse();
            Stream stream = response.GetResponseStream();
            using (BinaryReader br = new BinaryReader(stream))
            {
                content = br.ReadBytes(500000);
                br.Close();
            }
            response.Close();
            string CompleteDPath = "ftp path";
            string UName = "abc";
            string PWD = "123";

            WebRequest reqObj = WebRequest.Create(CompleteDPath + file_name);
            reqObj.Method = WebRequestMethods.Ftp.UploadFile;
            reqObj.Credentials = new NetworkCredential(UName, PWD);
            reqObj.GetRequestStream().Write(content, 0, content.Length);
            reqObj = null;

            //FileStream fs = new FileStream(file_name, FileMode.Create);
            //BinaryWriter bw = new BinaryWriter(fs);
            //bw.Write(content);
            //fs.Close();
            //bw.Close();
        }
        catch (Exception ex)
        {
            Response.Write(ex.Message);
        }

byte[] content;       
HttpWebRequest request1 = (HttpWebRequest)WebRequest.Create(url);    
WebResponse response1 = request1.GetResponse();
Stream stream = response1.GetResponseStream();
using (BinaryReader br = new BinaryReader(stream))
{
    content = br.ReadBytes((int)stream.Length);
    br.Close();
}
response1.Close();

FtpWebRequest request = (FtpWebRequest)WebRequest.Create("ftp://ftp_path");
request.Method = WebRequestMethods.Ftp.UploadFile;
request.Credentials = new NetworkCredential("abc", "123");
request.ContentLength = content.Length;
Stream requestStream = request.GetRequestStream();
requestStream.Write(content, 0, content.Length);
requestStream.Close();
FtpWebResponse response = (FtpWebResponse)request.GetResponse();
response.Close();