Application connection problems between linux & solaris?

HI,
Do you know if I can connect to a server on solaris with a java application and then I compile it on linux why cann't I get to the same application still runing on the solaris machine? A little fuzzy but ... I looked in the /etc/hosts but it looked ok (there were some ip addr there)...
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:320)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:133)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:120)
at java.net.Socket.<init>(Socket.java:273)
at java.net.Socket.<init>(Socket.java:100)

Thank you all of you in advance,
I found the problem : it just should have been the correct initialization.

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