problem with cookie in Curl

Question

I am developing a login with Curl and I am making two requests, the first one makes the post to the action page of the form and generates a txt file with the cookie, soon after I make a request using this file to access the protected page. but I do not have access to the page, the system makes a redirect to the error page.

  $tmpfname = dirname(__FILE__).'/cookies.txt';

  $ch = curl_init();
  curl_setopt($ch, CURLOPT_URL, $url);
  curl_setopt($ch, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
  curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($ch, CURLOPT_HEADER, 1);
  curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 120);
  curl_setopt($ch, CURLOPT_TIMEOUT, 120);
  curl_setopt($ch, CURLOPT_POST,true);
  curl_setopt($ch, CURLOPT_POSTFIELDS, $postfields);
  curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
  curl_setopt($ch, CURLOPT_VERBOSE, 1);
  curl_setopt($ch, CURLOPT_STDERR, $f);
  curl_setopt($ch, CURLOPT_COOKIEJAR, $tmpfname );
  curl_setopt($ch, CURLOPT_COOKIEFILE, $tmpfname );
  $redirectURL = curl_getinfo($ch,CURLINFO_EFFECTIVE_URL );
  $status = curl_getinfo($ch, CURLINFO_HTTP_CODE);
  curl_setopt($ch, CURLOPT_ENCODING, "");
  $err = curl_error($ch);
  $ret = curl_exec($ch);
  curl_close ($ch);


  $chl = curl_init();
  curl_setopt($chl, CURLOPT_RETURNTRANSFER, 1);
  curl_setopt($chl, CURLOPT_COOKIEFILE, $tmpfname );
  curl_setopt($chl, CURLOPT_URL, $urlll);
  curl_setopt($chl, CURLOPT_USERAGENT, $_SERVER['HTTP_USER_AGENT']);
  curl_setopt($chl, CURLOPT_SSL_VERIFYPEER, false);
  curl_setopt($chl, CURLOPT_HEADER, 1);
  curl_setopt($chl, CURLOPT_VERBOSE, 1);
  curl_setopt($chl, CURLOPT_CONNECTTIMEOUT, 120);
  curl_setopt($chl, CURLOPT_TIMEOUT, 120);
  curl_setopt($chl, CURLOPT_FOLLOWLOCATION, true);
  curl_setopt($chl, CURLOPT_ENCODING, "");
  $er = curl_error($chl);
  $hy = curl_exec($chl);
  curl_close ($chl);
  var_dump($hy);
  echo $hy;