ftp_get help on windows server

I have a small test script in which I am trying to download a file from my windows server. My script is running on a linux server. I can't login:

Warning: ftp_login() [function.ftp-login]: Login authentication failed.

The script works fine if I try to connect to a linux box, I can connect, login and download the file. But it won't work on my windows server. This is my first windows server so I don't know if I'm missing something.

$php_host_username = "username"; 
$php_host_password = "pw"; 
$conn = ftp_connect("ftp.mysite.com"); 
ftp_pasv($conn, TRUE);
if ($conn) 
   { 
     echo "ftp connect ok<br>"; 
     if (ftp_login($conn,$php_host_username,$php_host_password)) 
        { 
          echo "ftp_login ok<br>"; 
          if (ftp_get($conn,"dest.txt", "wwwroot/source.txt",FTP_ASCII)) 
             { 
               echo "ftp_get ok<br>"; 
             } 
          else 
             { 
               echo "ftp_get fail<br>"; 
             } 
        } 
     else 
        { 
          echo "ftp_login failed<br>"; 
        } 
   } 
else 
   { 
     echo "ftp connect failed<br>"; 
   } 
ftp_close($conn);  

PHP:

 

What kind of Windows server you have ? Maybe you've not configured it ( added users ) ?

 

I'm new to windows hosting so I can't answer your question - its a hosting account with AccuWebHosting and they have no answers either.