Question

Connection refused to host: 127.0.0.1

Asked by: fabient

Hi,

I have a Java RMI server running on Linux (2.6.18-53.1.4). I can connect via a RMI client on the server.
When I tried to connect via a RMI client on my local machine, I get the following exception:

Connection refused to host: 127.0.0.1; nested exception is:
 java.net.ConnectException: Connection refused: connect)
 at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:601)
 at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:1

I've tried the following links:

http://forum.springsource.org/showthread.php?t=33711

But no success.

Thanks for your help.

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Asked On
2009-11-04 at 05:54:13ID24870790
Tags

Java RMI connection refused

Topics

Linux Networking

,

Networking Protocols

,

Java Programming Language

Participating Experts
2
Points
500
Comments
9

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Answers

 

by: TomasHelgiPosted on 2009-11-04 at 06:37:00ID: 25739663

         Hi!

Have you checked your firewall ?
Does it allow access to your RMI port on localhost from all sources ?


Regards,
    Tomas Helgi

 

by: fabientPosted on 2009-11-04 at 06:44:44ID: 25739754

Hi Tomas,

The firewall is down.

[root@ init.d]# ./iptables status
Firewall is stopped.

 

by: gurvinder372Posted on 2009-11-04 at 06:56:57ID: 25739901

On linux, you have to explicitly open the port for an remote connection.

You can check if the port is open for a remote connection through
http://www.cyberciti.biz/tips/linux-scanning-network-for-open-ports.html

Follow this link to know how to open a port
http://www.linux-noob.com/forums/index.php?/topic/472-how-to-open-a-port/

 

by: TomasHelgiPosted on 2009-11-04 at 07:46:16ID: 25740468

         Hi!

What is your

Naming.rebind("rmi://host:port/service,object )

pointing at ?

Regards,
   Tomas Helgi

 

by: fabientPosted on 2009-11-04 at 07:47:05ID: 25740481

[root@]#nmap -sT -O localhost

PORT     STATE SERVICE
22/tcp   open  ssh
25/tcp   open  smtp
199/tcp  open  smux
631/tcp  open  ipp
1521/tcp open  oracle


The RMI port is 3081 and it seems to be listening:

[root@]# netstat -napt | grep 3081
tcp        0      0 :::3081                     :::*                        LISTEN      2559/java


I tried to use the command to open the port but it seems i have an other version of iptables?

[root@]# iptables -A INPUT -i eth0 -p tcp --sport 3081 -m state --state NEW,ESTABLISHED -j ACCEPT
Usage: ./iptables {start|stop|restart|condrestart|status|panic|save}

Any idea?
Thanks for your help.

 

by: TomasHelgiPosted on 2009-11-04 at 08:43:24ID: 25741190

       Hi!

In your code there is the line

Naming.rebind("rmi://host:port/service,object )

what is the host and port ?

Make sure that your that ifconfig, /etc/hosts and the host in the Naming.rebind are
all to the same hostname/IP address.
http://www.coderanch.com/t/208842/Distributed-Java/java/RMI-with-Localhost


Regards,
   Tomas Helgi

 

by: fabientPosted on 2009-11-04 at 23:26:30ID: 25747374

Hey thanks for your emails.

I've solved the problem by doing the following:

1. add -Djava.rmi.server.name=myhostname

2. update /etc/hosts

127.0.0.1 localhost
123.123.0.9 myshostname myhostname.mydomainname.com

Thanks for your advice.

 

by: fabientPosted on 2009-11-04 at 23:28:49ID: 31649966

needed a bit more information to complete the task.

 

by: TomasHelgiPosted on 2009-11-05 at 00:30:03ID: 25747585

You're welcome. :)

20120131-EE-VQP-002

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