java net ConnectException connection timed out connect

Question

I have used RMI in my code     import java rmi      public interface AddServerIntf extends Remote     double add double d1 double d2  throws RemoteException         import java rmi    import java rmi server     public class AddServerImpl extends UnicastRemoteObject implements AddServerIntf     public AddServerImpl   throws RemoteException         public double add double d1 double d2  throws RemoteException     return d1 d2             import java net    import java rmi     public class AddServer      public static void main String args          try        AddServerImpl addServerImpl new AddServerImpl         Naming rebind  AddServer  addServerImpl          catch Exception exc              System out println exc                       import java rmi    public class AddClient     public static void main String args           try          String Url  rmi     args 0    AddServer          AddServerIntf addServerIntf  AddServerIntf Naming lookup Url          System out println  The first number is   args 1           double d1 Double valueOf args 1   doubleValue           System out println  The second number is    args 2           double d2 Double valueOf args 2   doubleValue           System out println  The Sum is    addServerIntf add d1 d2            catch Exception exc             System out println exc                      These are 4  java files written   Next i compile all these files Then I create a stub using rmic AddServerImpl   After that i start rmi registry on server side using start rmiregistry  Then i start server using java AddServer and finally client using java AddClient 27 60 200 80 5 9  But nothing happens  Exception that is thrown on client side is java net ConnectException   connection timed out   connect  What is the reason and how can i solve this   On client machine these are the following  class files AddClient class AddServerImpl class AddServerImpl Stub class and on server side AddServer class AddServerImpl class AddServerImpl Stub class AddServerIntf class

User · Accepted Answer

The error message says it all  your connection timed out  This means your request did not get a response within some  default  timeframe  The reasons that no response was received is likely to be one of    a  The IP domain or port is incorrect   b  The IP domain or port  i e service  is down   c  The IP domain is taking longer than your default timeout to respond   d  You have a firewall that is blocking requests or responses on whatever port you are using   e  You have a firewall that is blocking requests to that particular host   f  Your internet access is down     Note that firewalls and port or IP blocking may be in place by your ISP

User · Answer

Number  1    The IP was incorrect - is the correct answer   The  etc hosts file  a k a  C  Windows system32 drivers etc hosts   had an incorrect entry for the local machine name  Corrected the  hosts  file and Camel runs very well   Thanks for the pointer

User · Answer

Exception   java net ConnectException  This means your request didn t getting response from server in stipulated time  And their are some reasons for this exception    Too many requests overloading the server Request packet loss because of wrong network configuration or line overload Sometimes firewall consume request packet before sever getting Also depends on thread connection pool configuration and current status of connection pool Response packet lost during transition

User · Answer

If you re pointing the config at a domain  eg fabrikam com   do an NSLOOKUP to ensure all the responding IPs are valid  and can be connected to on port 389   NSLOOKUP fabrikam com  Test-NetConnection  lt IP returned from NSLOOKUP gt  -port 389

[java] java.net.ConnectException :connection timed out: connect?

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