What port is used by Java RMI connection?

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+2 Q:

What port is used by Java RMI connection?

Hi,

May I know what port is used by Java RMI connection?

If I want to connect a Java client application to a Java server application using RMI connection, what port I need to open at the server machine so that the client application can connect to it?

I want to set up a firewall in the server machine but I don't know which port I should open.

Thanks.

+3 A:

By default, RMI uses port 1099

bunting 2010-06-18 16:21:55

But I heard from somewhere that some Java application connections are set to use a random port. Do you have any idea what kind of Java connection is that? Does it related to Java RMI? Thanks.

kwc 2010-06-18 16:27:56

Yes and no, see http://stackoverflow.com/questions/1706685/java-rmi-client-side-random-ports for more detail on this.

bunting 2010-06-18 16:41:16

+3 A:

You typically set the port at the server using the rmiregistry command. You can set the port on the command line, or it will default to 1099

El Guapo 2010-06-18 16:23:23

Can you show me how to use the rmiregistry command?

kwc 2010-06-18 16:25:23

jajaj +1 nomás por el nick y la foto :)

OscarRyz 2010-06-18 16:28:46

it's probably best to send you the link to the sun page with it:http://java.sun.com/docs/books/tutorial/rmi/running.htmlif it's a linux box just make sure you have the $JAVA_HOME/bin in your path and you'll be able to run the command

El Guapo 2010-06-18 16:32:31

+2 A:

RMI generally won't work over a firewall, since it uses unpredictable ports (it starts off on 1099, and then runs off with a random port after that).

In these situations, you generally need to resort to tunnelling RMI over HTTP, which is described well here.

skaffman 2010-06-18 16:34:28

@skaffman: Thank you very much! Have you read the answer from El Guapo at above? Do you think that is a workable alternative solution? Can I set the port at the server to a fixed port using the rmiregistry command?

kwc 2010-06-18 16:50:31

@kwc: You can set the RMI registry to a fixed port, yes, but I don't believe you can control individual client-server connections.

skaffman 2010-06-18 21:10:37

+2 A:

Geez, can't believe google is down again. anyway, seems to work from my box, so here ya go:

Java RMI FAQ (firewall)

james 2010-06-18 17:40:47

ansaurus

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What port is used by Java RMI connection?

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