Sending messages to ejabberd doesn't work for me

Hi,

I'm new in ejabberd and I'm trying to create a java program only to do some test with the service ejabberd, but always have the same response from the server.

The server is running because I can try with two pidgin clients.

I'm trying to follow the samples of
http://xmpp.org/extensions/xep-0016.html

And about the code

ConnectionConfiguration cc = new ConnectionConfiguration("ip_server", 5222, "domain_defined_in_cfg");
// In ejabberd.cfg -> {hosts, ['domain_defined_in_cfg']}
cc.setDebuggerEnabled(true);
cc.setSASLAuthenticationEnabled(true);

XMPPConnection con = new XMPPConnection(cc);
System.setProperty("smack.debugEnabled", "true");
XMPPConnection.DEBUG_ENABLED = true;
try {
            SASLAuthentication.supportSASLMechanism("PLAIN", 0);
            con.connect();

            //This line returns
            /*
No response from the server.:
at org.jivesoftware.smack.SASLAuthentication.bindResourceAndEstablishSession(SASLAuthentication.java:430)
at org.jivesoftware.smack.SASLAuthentication.authenticate(SASLAuthentication.java:331)
at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:395)
at org.jivesoftware.smack.XMPPConnection.login(XMPPConnection.java:349)
            */
            //con.login("user_admin", "password_user_admin");

Packet packet = new Packet() {
                @Override
                public String toXML() {
                    //Sample of iq request
                    StringBuilder sb = new StringBuilder("<iq type=\"get\" to=\"ip_server\">");
                    sb.append("<query xmlns=\"jabber:iq:version\"/>");
                    sb.append("</iq>");
                    return sb.toString();
                }
            };
            con.sendPacket(packet);

} catch (XMPPException xe) {
            xe.printStackTrace();
            return;
}

When I send the iq request of the code or another like this

<iq from='user@domain.com' type='get' id='getlist1'>
<query xmlns='jabber:iq:privacy'/>
</iq>

to the server, I always received the same response

<iq id="getlist1" from="domain.com" type="error"><error code="503" type="CANCEL"><service-unavailable xmlns="urn:ietf:params:xml:ns:xmpp-stanzas"/></error></iq>

Just only try to follow the example 1 of http://xmpp.org/extensions/xep-0016.html

The login could be a problem, but anyway, I'm more interesting in why can't I send messages to the server. Or, how can I send messages in another way? (I checked with putty too)

Any ideas?

Thanks!

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