java rmi ConnectException Connection refused to host 127 0 1 1

Question

java rmi ConnectException  Connection refused to host  127 0 1 1  nested exception is      java net ConnectException  Connection refused     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 invoke UnicastRef java 128      at java rmi server RemoteObjectInvocationHandler invokeRemoteMethod RemoteObjectInvocationHandler java 194      at java rmi server RemoteObjectInvocationHandler invoke RemoteObjectInvocationHandler java 148      at com sun proxy  Proxy0 notifyMe Unknown Source      at CallbackServerImpl doCallback CallbackServerImpl java 149      at CallbackServerImpl registerForCallback CallbackServerImpl java 70      at sun reflect NativeMethodAccessorImpl invoke0 Native Method      at sun reflect NativeMethodAccessorImpl invoke NativeMethodAccessorImpl java 57      at sun reflect DelegatingMethodAccessorImpl invoke DelegatingMethodAccessorImpl java 43      at java lang reflect Method invoke Method java 601      at sun rmi server UnicastServerRef dispatch UnicastServerRef java 322      at sun rmi transport Transport 1 run Transport java 177      at sun rmi transport Transport 1 run Transport java 174      at java security AccessController doPrivileged Native Method      at sun rmi transport Transport serviceCall Transport java 173      at sun rmi transport tcp TCPTransport handleMessages TCPTransport java 553      at sun rmi transport tcp TCPTransport ConnectionHandler run0 TCPTransport java 808      at sun rmi transport tcp TCPTransport ConnectionHandler run TCPTransport java 667      at java util concurrent ThreadPoolExecutor runWorker ThreadPoolExecutor java 1145      at java util concurrent ThreadPoolExecutor Worker run ThreadPoolExecutor java 615      at java lang Thread run Thread java 722      Caused by  java net ConnectException  Connection refused     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  lt init gt  Socket java 425      at java net Socket  lt init gt  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          23 more   I get this exception when I try to connect a remote client to my server  In both  server and client the hostName for the registryUrl of rmi is the public IP address of the server  I also tried to put localhost in server but the error doesn t change    My java policy is set to grant all connections to all ports and I have no firewalls enabled in the server or the client   Any suggestions what could be

User · Answer

you can use LocalRegistry such as   Registry rgsty   LocateRegistry createRegistry 1888   rgsty rebind  hello   hello

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If you ve tried modifying etc hosts and adding java rmi server hostname property as well but still registry is being bind to 127 0 0 1  the issue for me was resolved after explicitly setting System property through code though the same property wasn t picked from jvm args

User · Answer

If you re running in a Linux environment  open the file  etc hosts allow add the following line ALL  Wildcards Also check the  etc hostname and  etc host to see if there might be something wrong there  I had to change my   etc   host from 127 0 0 1 localhost 127 0 1 1 AMK  to 127 0 0 1 localhost 127 0 0 1 AMK  also wrote in ALL in the file  etc hosts allow which was previously completely empty Now everything works do not know how safe it is  you have to read more about possible options for  etc hosts allow to do something that requires a touch of security

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PROBLEM SOLVED  I had exactly the same error  When the remote object got binded to the rmiregistry it was attached with the loopback IP Address which will obviously fail if you try to invoke a method from a remote address  In order to fix this we need to set the java rmi server hostname property to the IP address where other devices can reach your rmiregistry over the network  It doesn t work when you try to set the parameter through the JVM  It worked for me just by adding the following line to my code just before binding the object to the rmiregistry   System setProperty  java rmi server hostname   192 168 1 2     In this case the IP address on the local network of the PC binding the remote object on the RMI Registry is 192 168 1 2

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In my case I was unable to edit the hosts file because using a pc from the university   I fixed the problem running rmiregistry in another port  instead of 1099  with   rmiregistry  lt port gt    and then running the server on that port   It was basically an error caused by occupied port

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I found many of the Q amp A on this topic  not nothing was helping me - that s because my issue was more basic   what can I say I am not a networking guru        My ip address in  etc hosts was incorrect   What I had tried included the following for CATALINA OPTS   CATALINA OPTS   CATALINA OPTS -Djava awt headless true -Xmx128M -server  -Dcom sun management jmxremote  -Dcom sun management jmxremote port 7091  -Dcom sun management jmxremote authenticate false  -Dcom sun management jmxremote ssl false -Djava rmi server hostname A B C D    howeverI put the wrong ip here   export CATALINA OPTS   My problem was that I had changed my ip address many months ago  but never updated my  etc hosts file   it seems that by default the jconsole uses the hostname -i ip address in some fashion even though I was viewing local processes   The best solution was to simply change the  etc hosts file   The other solution which can work is to get your correct ip address from  sbin ifconfig and use that ip address when specifying the ip address in  for example  a catalina sh script   -Djava rmi server hostname A B C D

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Simply you can use   on server side   Registry  lt objectName1 gt   LocateRegisty createRegistry 1099   Registry  lt objectName2 gt   LocateRegisty getRegistry      on Client Side   Registry  lt object name you want gt   LocateRegisty getRegistry

User · Answer

This is item A 1 in the RMI FAQ  You need to either fix your  etc hosts file or set the java rmi server hostname property at the server

User · Answer

It works for me after getting rid of    1  in  etc hosts

User · Answer

Maybe your rmiregistry not be created before client trying connect to your server and it would lead to this exception In Linux  you can use  netstat  to check your rmiregistry be bond on the right port you assigned in java code

User · Answer

When I got the same error on my machine   connection is refused    the reason was that I had defined the following on the server side     Naming rebind  rmi   localhost 8080 AddService      addService      Thus the server binds both the IP   127 0 0 1 and the port 8080   But on the client side I had used   AddServerInterface st    AddServerInterface Naming lookup  rmi   localhost                             AddService      Thus I forgot to add the port number after the localhost  so I rewrote the above command and added the port number 8080 as follows   AddServerInterface st    AddServerInterface Naming lookup  rmi   localhost 8080                             AddService      and everything worked fine

User · Answer

when you want to connect to remote server with RMI you must add a system property same as   System setProperty  java rmi server hostname   Ip or DNS of the server      or add environment variable   For me I got Connection Refused and solve it by adding this line of code in server side    java -jar -Djava rmi server hostname  ip or dns of the server  packageName jar   Thank to other guy for guide me to solve it

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On Windows make sure your Windows firewall is correctly configure   disabled  I had to disable the Windows firewall  because I didn t bother with configuring it  to get things to work even when I was testing with localhost

User · Answer

I had the same exact problem and my issue was that I had 2 IP addresses from 2 different networks configured in the etc hosts as below   10 xxx x xxx    localhost 192 xxx x xxx   localhost   This should be because there was a conflict as to which IP to be used for the other devices to reach the rmiregistry over the network   Once I removed the extra-record that is not required  I was able to solve the issue   So my etc hosts file had only the following record   10 xxx x xxx    localhost

[java] java.rmi.ConnectException: Connection refused to host: 127.0.1.1;

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