Socket connection refused - please help!!!!

My socket programs dont work in linux it shows error -
ot@localhost winc]# java parser
Exception in thread "main" java.net.SocketException: Invalid argument or cannot assign requested address
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at java.net.Socket.<init>(Socket.java:309)
at java.net.Socket.<init>(Socket.java:124)
at parser.main(parser.java:10)
Even the basic client server programs show this kind of error in linux. what is the cause for it? And the same programs work perfectly when run in windows. i have removed the firewall settings etc and it still doesnot work in linux
Please help me solve the problem . it is very urgent.

Actually i don't know how the firewall can cause the problem, can u please explain me.
Here is the stack trace.
INFO: Thread-3::Wed Dec 03 11:27:00 EST 2008 : resetConnection-->Connection couldn't be established with the Outbound message receiver at: 157.21.29.121:4996
Dec 3, 2008 11:27:05 AM com.lsc.hl7.handler.THOutboundProperties log
INFO: Thread-3::Wed Dec 03 11:27:05 EST 2008 : resetConnection-->Trying to reconnect[in IOException]........
The Message is: Connection refused: connect
The exception trace is :
java.net.PlainSocketImpl.socketConnect(Native Method)
java.net.PlainSocketImpl.doConnect(Unknown Source)
java.net.PlainSocketImpl.connectToAddress(Unknown Source)
java.net.PlainSocketImpl.connect(Unknown Source)
java.net.SocksSocketImpl.connect(Unknown Source)
java.net.Socket.connect(Unknown Source)
java.net.Socket.connect(Unknown Source)
com.lsc.hl7.handler.THOutboundConnHandler.resetConnection(THOutboundConnHandler.java:129)
com.lsc.hl7.handler.THOBHandlerThread.sendMailAndLogAboutORUReceiverConnectionLoss(THOBHandlerThread.java:199)
com.lsc.hl7.handler.THOBHandlerThread.run(THOBHandlerThread.java:118)

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