I am trying to connect to JBoss from a client but
I get the exception below.
I used the correct server address in jndi.properties
java.naming.provider.url=xxx.xxx.xxx.xxx:1099

What is wrong? Why 127.0.0.1 instead of xxx.xxx.xxx.xxx?

Root exception is java.rmi.ConnectException: Connection refused to host: 127.0.0.1; nested exception is:
java.net.ConnectException: Connection refused
java.net.ConnectException: Connection refused
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:320)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:133)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:120)
at java.net.Socket.(Socket.java:273)
at java.net.Socket.(Socket.java:100)
at sun.rmi.transport.proxy.RMIDirectSocketFactory.createSocket(RMIDirectSocketFactory.java:25)
at sun.rmi.transport.proxy.RMIMasterSocketFactory.createSocket(RMIMasterSocketFactory.java:120)
at sun.rmi.transport.tcp.TCPEndpoint.newSocket(TCPEndpoint.java:499)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:190)
at sun.rmi.transport.tcp.TCPChannel.newConnection(TCPChannel.java:174)
at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:83)
at org.jnp.server.NamingServer_Stub.lookup(Unknown Source)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:365)
at org.jnp.interfaces.NamingContext.lookup(NamingContext.java:349)

There is something wrong with your ip configuration.
RMI thinks your server's ip address is 127.0.0.1

You can check this by adding the following parameter
to the java command in run.sh or run.bat

(on the SERVER side !)

-Djava.rmi.server.hostname

RMI will now use the server's hostname instead of
trying to determine the ip address.
If this fixes your problem, then check you ip configuration.

You might want to continue to use host names?

Regards,
Adrian

"cpaul_it" wrote:

"cpaul_it" wrote:
The client having it's own jndi.properties still does not work.

I have two ip addresses on the JBoss server machine (one is 10.0.0.17 and the other is external).

On the client machine, which has only one ip address (10.0.0.51) I set the java.naming.provider.url to 10.0.0.17:1099. I know I am hitting the JBoss Server, because the java.rmi.ConnectIOException that is thrown indicates a failure trying to open a socket using the JBoss server's external ip address. The only way it could get the external address would be from the naming service running on the JBoss server.

Any other ideas?

"cpaul_it" wrote:

"cpaul_it" wrote:
As I continued to research, I eventually came back to this topic several times, and finally I realized that I had not picked up on the -Djava.rmi.server.hostname entry. So, as instructed, I set it to
-Djava.rmi.server.hostname=10.0.0.17 and it worked perfectly.

Thanks Adrian!

Paul

"Tobias" wrote:

"Tobias" wrote:
On newer JBoss versions the error message may read:

javax.naming.CommunicationException. Root exception is
java.rmi.ConnectException: 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:567)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185)


On the machine the JBoss server runs on check your /etc/hosts file. Only having an localhost entry there is not enough. You need an additional entry with your IP address and your host name of the server.

RedHat installations are known to have these problems :(.

"Tobias" wrote:

"Tobias" wrote:
On newer versions of JBoss the error message may vary, one reads:

javax.naming.CommunicationException. Root exception is
java.rmi.ConnectException: 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:567)
at sun.rmi.transport.tcp.TCPChannel.createConnection(TCPChannel.java:185)


RedHat installations are known to have a wrong /etc/hosts file on the SERVER. You need to check the following on the SERVER.

The command "hostname" returns the used hostname, let's say it is "peterpan". /etc/hosts needs to look like this then:


10.0.0.1 peterpan
127.0.0.1 localhost.localdomain localhost


After that change "ping peterpan" should NOT ping to 127.0.0.1 but to the server IP address which was assumed to be 10.0.0.1 in the above example.

Restart the JBoss server now and try again.

"kg1959" wrote:

"kg1959" wrote:
Thanks for your valuable research work, fellows.

I took the solution to add an additional line in the /etc/hosts -file and now the clients run fine without the mentioned exception.

I hesitate to try out the -Djava=.... -parameter-solution as the run.sh -script looks pretty complicated to me (newbie).

OS on my machine: RedHat-Linux 7.1

Thanks again !
Kurt

"jonlee" wrote:

"jonlee" wrote:
This is a known Sun Java RMI problem. Usually on Unices, the recommended solution is to ensure that the /etc/hosts is properly configured for resolution of the hostname.

However, this becomes a problem if you have DHCP on your primary interface. In this case, you may need to revert to using the -D:java.rmi.server.hostname=xxx.xxx.xxx.xxx type substitution or if you have a secondary interface, changing the hostname resolution in /etc/hosts to the secondary interface. You may have network-related side-effects with the latter.

If you must bind to the DHCP interface, you can put in some scripting substitutions to substitute the current assigned IP address. The problem will be that if the IP address changes during the lifetime of the server runtime instance, you will need to restart JBoss.

We've also had problems on Windows when dialled up to a client. If you start up JBoss when connected, the primary interface is the PPP. After disconnection, JBoss fails because the RMI interface was the PPP which has now gone - so you need to restart JBoss for things to work again.

"keith_elliott" wrote:

"keith_elliott" wrote:
I recently experienced a similar problem.

In my case, JNDI simply would hang - no errors, no response, just hang.

Ultimately, we realized we had our /etc/hosts file setup incorrectly - the IP for the server was invalid.

Here's the thread where I discuss it in more detail: http://www.jboss.org/modules/bb/index.html?module=bb&op=viewtopic&t=

"buckman1" wrote:

"buckman1" wrote:
I'd just like to add, if you are trying to cluster JBoss with a linux and windows machine, you'll want to also make sure to do this step. I found out the hard way with RedHat 9 that even though the JavaGroups multi-cast test worked, I was still not seeing the windows and linux nodes find each other.