web socket server only works with localhost

I'm setting up a chat where I have a client.php and a server.php. In the server.php code I define IP as 127.0.0.1 and Port 1900. When I change the IP to fixed IP or to hostname, the server.php can not start, it only works if I leave 127.0.0.1 or localhost. I need help debugging the code and knowing why it is not accepting the fixed IP. The problem occurs in the last line in wsStartServer.

    <?php
// prevent the server from timing out
set_time_limit(0);
    echo "<script type='javascript'>alert('Passou aqui');";
    echo "Aquiii";

// include the web sockets server script (the server is started at the far bottom of this file)
require 'class.PHPWebSocket.php';

// when a client sends data to the server
function wsOnMessage($clientID, $message, $messageLength, $binary) {
    global $Server;
    $ip = long2ip( $Server->wsClients[$clientID][6] );

    // check if message length is 0
    if ($messageLength == 0) {
        $Server->wsClose($clientID);
        return;
    }

    //The speaker is the only person in the room. Don't let them feel lonely.
    if ( sizeof($Server->wsClients) == 1 )
        $Server->wsSend($clientID, "There isn't anyone else in the room, but I'll still listen to you. --Your Trusty Server");
    else
        //Send the message to everyone but the person who said it
        foreach ( $Server->wsClients as $id => $client )
            if ( $id != $clientID )
                $Server->wsSend($id, "Visitor $clientID ($ip) said \"$message\"");
}

// when a client connects
function wsOnOpen($clientID)
{
    global $Server;
    $ip = long2ip( $Server->wsClients[$clientID][6] );

    $Server->log( "$ip ($clientID) has connected." );

    //Send a join notice to everyone but the person who joined
    foreach ( $Server->wsClients as $id => $client )
        if ( $id != $clientID )
            $Server->wsSend($id, "Visitor $clientID ($ip) has joined the room.");
}

// when a client closes or lost connection
function wsOnClose($clientID, $status) {
    global $Server;
    $ip = long2ip( $Server->wsClients[$clientID][6] );

    $Server->log( "$ip ($clientID) has disconnected." );

    //Send a user left notice to everyone in the room
    foreach ( $Server->wsClients as $id => $client )
        $Server->wsSend($id, "Visitor $clientID ($ip) has left the room.");
}

// start the server
$Server = new PHPWebSocket();
$Server->bind('message', 'wsOnMessage');
$Server->bind('open', 'wsOnOpen');
$Server->bind('close', 'wsOnClose');
// for other computers to connect, you will probably need to change this to your LAN IP or external IP,
// alternatively use: gethostbyaddr(gethostbyname($_SERVER['SERVER_NAME']))
$Server->wsStartServer('127.0.0.1', 1900);

?>