Can't connect java socket server in MAC OS

Does any know what settings need to be done in order to connect socket server written in java on MACOS.
my socket server is running on 5000 port, i've tried on running server on linux, and my program is able to receive the request from remote unix server.
but when the server is running on mac OS, the the unix server couldn' connect to the socket.
is this a port blocking problem?
can someone tell me what to do to make server on MAC OS available for receiving request?
Thanks

Who is the sys/net admin for the Mac?

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    i also have this problem..do u have any solution?

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