php - MySQL Database Connection Problems -

i set a database, , made code allowed people register members page on website i'm building. code used has worked before, many times, reason keep getting error message when try submit data test:

failed connect server: lost connection mysql server @ 'reading initial communication packet', system error: 111 

i've tried know, nothing works. think i'm missing something, here's php code sends data (however, nothing in code seems wrong or out of place):

<?php  session_start();   require_once('config.php');   $errmsg_arr = array();   $errflag = false;   $link = mysql_connect(db_host, db_user, db_password); if(!$link) {     die('failed connect server: ' . mysql_error()); }   $db = mysql_select_db(db_database); if(!$db) {     die("unable select database"); }   function clean($str) {     $str = @trim($str);     if(get_magic_quotes_gpc()) {         $str = stripslashes($str);     }     return mysql_real_escape_string($str); }   $fname = clean($_post['fname']); $lname = clean($_post['lname']); $login = clean($_post['login']); $password = clean($_post['password']); $cpassword = clean($_post['cpassword']);   if($fname == '') {     $errmsg_arr[] = 'first name missing';     $errflag = true; } if($lname == '') {     $errmsg_arr[] = 'email';     $errflag = true; } if($login == '') {     $errmsg_arr[] = 'login id missing';     $errflag = true; } if($password == '') {     $errmsg_arr[] = 'password missing';     $errflag = true; } if($cpassword == '') {     $errmsg_arr[] = 'confirm password missing';     $errflag = true; } if( strcmp($password, $cpassword) != 0 ) {     $errmsg_arr[] = 'passwords not match';     $errflag = true; }   if($login != '') {     $qry = "select * members login='$login'";     $result = mysql_query($qry);     if($result) {         if(mysql_num_rows($result) > 0) {             $errmsg_arr[] = 'login id in use';             $errflag = true;         }         @mysql_free_result($result);     }     else {         die("query failed");     } }   if($errflag) {     $_session['errmsg_arr'] = $errmsg_arr;     session_write_close();     header("location: register-form.php");     exit(); }    {     mkdir("somedirectory//$login") or die ("could not make directory"); }  {     $ourfilename = "somedirectory/$login/verify.txt";     $ourfilehandle = fopen($ourfilename, 'w') or die("can't open file");     fclose($ourfilehandle);      $ourfilename = "somedirectory/$login/name.txt";     $ourfilehandle = fopen($ourfilename, 'w') or die("can't open file");     fclose($ourfilehandle);  }  {      $myfile = "somedirectory/$login.txt";     $fh = fopen($myfile, 'w') or die("can't open file");     $stringdata = "$login\n";     fwrite($fh, $stringdata);     fclose($fh); } {      $file = '000001.php';     $newfile = "somedirectory/$login/$login.php";      if (!copy($file, $newfile)) {         echo "failed copy $file...\n";}  }     $qry = "insert members(firstname, lastname, login, passwd) values('$fname','$lname','$login','".md5($_post['password'])."')"; $result = @mysql_query($qry);   if($result) {     header("location: register-success.php");     exit(); }else {     die("query failed"); }    ?> 

any ideas causing mysql connection error?

system error 111 econnrefused, there isn't listening on specified host; either host incorrect or mysql isn't running on it.