RMI Invocation Behind Firewall on JBoss 4.0.3

[tanwilliam83]

Hi everyone,

I'm currently running a JBoss 4.0.3 server behind a firewall. The firewall is configured to allow all the ports used by JBoss 4.0.3 according to this article as below:

http://docs.jboss.org/jbossas/jboss4guide/r4/html/ch8.chapter.html#d0e21126

I'm also using all the default ports such as 8080 for Web, 1099 for JNP service and more.

For lookup, I use the following as PROVIDER_URL:

jnp://xxx.xxx.xxx.xxx:1099

The IP (xxx.xxx.xxx.xxx) is not the issue in this case as I am sure that the client is able to connect to the JBoss Server at this IP.

The problem is whenever I invoke RMI, i can see the client is communicating with the JBoss Server at an anonymous port such as 30599 or any ports. There are others connection on port 1098, 4444 and 8093 as well but these connections do not face any problem as they are allowed by the firewall. However, the connection on anonymous port would be a BIG PROBLEM because I'm not be able to configure my firewall to allow this traffic on this anonymous port since the anonymous port keeps on changing whenever the JBoss Server is restarted.

Anyone has any idea about this? I've spent weeks on this but I don't really see a solution yet.

Thanks in advance.

Best regards,
William

[solomonk]

as i understood this is an issue with RMI protocol - really it is opens two connections - one on fixed port and one on random..

you can override default rmi socket factory in your rmi client to be second port also fixed..

[adamwynne]

solomonk,

Can you specify how to cause that second port to be fixed? I am having a similar issue.

[solomonk]

"adamwynne" wrote:
solomonk,
Can you specify how to cause that second port to be fixed? I am having a similar issue.

try to look for example here http://forum.java.sun.com/thread.jspa?forumID=58&messageID=413193&threadID=146155

there are some java code to answer your question.. i think this issue is somehow resolved in java 5.. but i'm not sure - please ask on java.sun.com forums for more details..