[flexcoders] can not connect jms service between two application

[xieyf0413]

    I'm trying to connect to our JMS service (Apache ActiveMQ), if I 
add my jms service to my app application  , everything goes well ,  
flex can consumer the jms message ; but if  my app application is an 
application ,and jms service is another application ,my flex client can 
not receive jms message ,why ? my web server is tomcat 5.5 .
who can help me ,thanks very much.