The only time I had problems connecting to jrec like you're describing is when I didn't have the password entered correctly in trio.xml on this line:

<server name="jrec" title="JReceiver" descr="Open source audio server - hosting the Rio and beyond" class="trio.player.TRioPlayerJRecServer" url="http://192.168.1.103:8080/jrec_serv/servlet/RPC2" user="trio" password="triopassword"/>