RMI through a Firewall

3363700

Hello all,

i read some article that describe and resolve the RMI port problems (the RMI open for a connection a second random port).

Here an example of the article that i have found Java RMI - Two things to remember

The problem is that i have implemented how described into the article (overwrite the RMISocketFactory class), but the result don't resolve the problem.

In others words I have only a call to the createSocket method (with port=2005 that is the port where the rmi ServerSocket is listening) that create two connection at port 2005 and another random port. I don’t have a call to a createSocket with port 0 that I can intercept.

I think that is impossible to remap the second random port to a defined value.

I work in windows with JBuilder.

The thing that “baffles” me is that is strange, that a known problem like this it, has not been resolved in all this year from the java distributors.

What do you think about this?

What is that I fail to see?

Thanks for your time

Best regards

StefanP-Oracle

Hi

RMI use random ports for communication between the stub and the remote object

for pass this traffic to firewall,

the solution is to tunnel RMI traffic over HTTP

please check:

https://docs.oracle.com/javase/8/docs/platform/rmi/spec/rmi-arch6.html

3.5 RMI Through Firewalls Via Proxies

Regards

Stefan

3363700

Hi Stefan

thank for your answer,

However i have found here:

https://docs.oracle.com/javase/8/docs/api/java/rmi/server/RMISocketFactory.html

that the http tunnelling is deprecated, and "are subject to removal ..."

There's just no other way to use RMI with a Firewall?

Best Regards

Marco