java.rmi.ConnectException: Connection refused to host:

Question

  java.rmi.ConnectException: Connection refused to host: IPSERVER0.0.0.0.0; nested exception     is: 
java.net.ConnectException: Connection timed out
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:619)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:216)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:202)
at sun.rmi.server.UnicastRef.newCall(UnicastRef.java:340)
at sun.rmi.registry.RegistryImpl_Stub.lookup(Unknown Source)
at java.rmi.Naming.lookup(Naming.java:101)
at StartRMI.go(StartRMI.java:14)
at StartRMI.main(StartRMI.java:6)
    Caused by: java.net.ConnectException: Connection timed out
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:339)
at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:200)
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:182)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:391)
at java.net.Socket.connect(Socket.java:579)
at java.net.Socket.connect(Socket.java:528)
at java.net.Socket.<init>(Socket.java:425)
at java.net.Socket.<init>(Socket.java:208)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:40)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:146)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:613)
... 7 more

I get this exception when I try to connect a remote client to my server. My Server is running RMI Server fine, and there no firewall installed. How to fix that issue ?

Solution

Check all you network adapters ,some time a VM network adapter interferes in this way . Which is you current localhost or 127.0.0.1 is not any more referring to you host name or current machine ,which then create a connection refused problem. My General Recommendation is:

1.To check or disable unwanted VM or Network Adapters

2.Ping 127.0.0.1

3.Disable Firewall and Test if all the above doesn't work 

4.Add security Manager with a policy file on you server if you haven't done that.