java.rmi.ConnectException: Connection refused to host

hi
i write a simple test program using RMI. If the rmiregistry is placed on a
host:10.5.0.57,and rmi server and client are deployed on host :10.5.0.178,then
everything is OK,but when I run the client program on a host:10.5.0.173,the
client report exceptions as follows:
HelloClient exception: Connection refused to host: 10.5.0.173; nested
exception is:
        java.net.ConnectException: Connection refused
java.rmi.ConnectException: Connection refused to host: 10.5.0.173; nested
exception is:
        java.net.ConnectException: Connection refused
        at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:601)
        at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java
:198)
        at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java
:184)
        at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:322)
        at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
        at examples.rmisocfac.HelloClient.main(HelloClient.java:59)
Caused by: java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:333)
        at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java
:195)
        at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:182)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:366)
        at java.net.Socket.connect(Socket.java:519)
        at java.net.Socket.connect(Socket.java:469)
        at java.net.Socket.<init>(Socket.java:366)
        at java.net.Socket.<init>(Socket.java:179)
        at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(
RMIDirectSocketFactory.java:22)
        at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(
RMIMasterSocketFactory.java:128)
        at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:595)
        ... 5 more
Do everyone know why?

===========================================================================
To unsubscribe, send email to [email protected] and include in the body
of the message "signoff RMI-USERS".  For general help, send email to
[email protected] and include in the body of the message "help".

For a list of frequently asked RMI questions please refer to:
http://java.sun.com/j2se/1.3/docs/guide/rmi/faq.html

To view past RMI-USERS postings, please see:
http://archives.java.sun.com/archives/rmi-users.html