Application only works on localhost...why?

i followed examples , created live video stream test app. works when on 1 machine, meaning fms , tomcat both on same machine. but, when try access machine, other machine cannot see live stream. did research on , of them point problem netconnection.connect method.

since both apps + fms on same machine, tried

.connect ("rtmp:/apps/session");

.connect("rtmp://localhost/apps/sesson");

.connect("rtmp://machine.domain.com/apps/session");

.connect("rtmpt://ip address/apps/session"):

all of above works when local machine. but, other machine doesn't work?

a couple of questions:

1. ip you're using wan ip or lan ip?
2. fms machine firewalled, , if so, have set firewall allow inbound/outbound traffic on port 1935?
3. network using hub/switch, or router? routers little goofy when using wan ip within network.

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