Upload file ไป Server ไม่ได้ ERROR logon failure unknown username or bad password

                        string P1 = CLS.clsSecutityLBC.Decrypt(_PathFilePDFUploadNewwork);
                        Uri addy = new Uri(P1 + fileName);
                        //string NewFilename = CLS.clsSecutityLBC.Encrypt(this.lblDocrecgen_.Text.ToString());
                        string NewFilename = this.lblDocrecgen_.Text;
                        string fRunning = "1";
                        string Comma = "-";
                        client.Credentials = nc;
                        string P2 = CLS.clsSecutityLBC.Decrypt(_PathFilePDFUploadNewwork);
                        byte[] arrReturn = client.UploadFile(addy, textBox1.Text);
                        string strOldDirPath;
                        strOldDirPath = P1+fileName;
                        string strNewDirPath;
                        strNewDirPath = P1+NewFilename+Comma+fRunning+".pdf";
                        Directory.Move(strOldDirPath,strNewDirPath);
                        Upload_f._FileName = NewFilename + Comma + fRunning;
                        Upload_f._ID_OrderByF = fRunning;
                        Upload_f._DateName = "";
                        Upload_f._ID_OrderByF = fRunning;
                        //string D1 = CLS.clsSecutityLBC.Decrypt(NewFilename);
                        Upload_f._DocreccordGen_File = NewFilename;
                        Upload_f._LinkOpenFile = _PathFilePDFUploadNewwork.ToString();
                        SqlDataReader objreadUp = objUpl.ObjectSaveDataFileUploads(Upload_f);
                        MessageBox.Show("จัดเก็บไฟล์เรียบร้อยแล้ว", "ยืนยัน", MessageBoxButtons.OK);