I have some linux machines behind one router.
I must to redirect the trafic to one machine, which has the RMI server.
I have read that the rmi runs into the 1099 port.
i have redirect this port but te application still doesn't run.
if i runs the application using the internal net i see tha the client conects to the RMI server using the 1099 port and also other hihg port (+32000).
this second port can i specify into the application?
how?
or which posts must i to open,a nd redirect?

Thanks

 

 

Unless you do some extra work, rmi servers will communicate with clients using random ports.

o You can write and use your own rmi socket factory, which always assigns a fixed port number.

o You can - perhaps - have your server call its super and name a fixed port. (See the docs or source code for UnicastRemote object. I say "perhaps", because I have never used this.

 

 

You can change the port your RMI objects bind to by specifying it in your constructor when you call UnicastRemoteObject's super(). Look at the constructors for UnicastRemoteObject. One of them takes a port to bind to. You can put any number of RMI objects binding to the same port because they will share the ServerSocket being used. (One caveat is that all objects sharing the same port must use the same SocketFactory if you are using a non-default SocketFactory).

charlie

 

 

There is 1 question i would like to ask. Just like RMI registry running at port 1099, the client has to specify:
Naming.lookup("//rmiserverHostName:1099/xxx")
On the client side, must i specify the UnicastRemoteObject port to which the RMI server is supposed to listen?

Your help is appreciated.

 

 

The port 1099 is the default port used by RMI to bind the object in the registry.It is not mandatory to specify it.
You can use any other port, but make sure to do it like you said in the last message.
Please take a look on my message that I posted earlier on this forum regarding RMI.
If your server is behind the Firewall, then you need to define two ports: one to bind the object in registry, the second one to communicate between client and server.Use FixedSocketFactory to custom the used ports.
One more think:Make sure they are opened and unused in the Firewall.

Hope this will solve your problem
Good luck.
Gheorghe

 

 

hi Gheorghe,

Thanx for replying. I have managed to define the 2 ports and run them up in the server. On the client side, what must i do to target at the 2 ports. For the registry port, i know i must do this:
Naming.lookup("//rmiserverHostName:<port>/xxx").

What about second one to communicate between client and server? What must i do at the client side?

 

 

Nothing. That is a function of the RMI system.

 

 

indeed. I have got it all done up. thanx guys.

 

 

I have a similar problem is using RMI with our firewall using random high ports

Do you have any sample code of both client and server including the rim.policy file you can share

Thanks

 

 

Hi,
We have SunSystems SunAccounts application ver 4. We want to connect the client to the remote site using the VPN. But, not able to do so. It only possible when all the TCP ports are open in the firewall. Then only client connects to Remote site.
Please give me the advice as why the SunSystems selects random port for the client server connection and how to secure the network when all the TCP ports are open.

 

 

Help !

I have two linux boxes, one as server running rmiregistry and a server program as daemon, and the other as client.
And there is one firewall machine between them.

The firewall allows
1. the access to 1099,12000 of server ports from client's any port.
2. the access to client's any port from server when the access is only the reply for the client's request.

The problem is
1. the server tries to make a new connection to client NOT as a reply from client's request.
2. it is always denied by firewall, and the server program is timed out.
3. I found that it was invoked by java.rmi.dgc

I want to know
1. howto set the client's port allowing to access from server's dgc.
2. howto disable the server's dgc, if possible.

Can I have any help?

 

 

Do you have client-side callbacks in your system? If so, you will have to export them on a fixed port and have your firewall open that port in the server->client direction.

 

 

Thank you.

The server/client program is multi-threading program.
Client's request is 32 max at the same time
and server's thread is 512 max per one client's request
at the same time.
I didn't know that java.rmi.dgc was occured in the server program.
So, I want to stop the java.rmi.dgc.
I failed to find that my program has any code occuring it.

Could you explain howto more detail ?
Sorry, I'm afraid I am not a good english speaker.

 

 

I don't know how to ask this any more clearly. Do you have any client-side callbacks in your system?

This means, do you export any remote objects at the client and send them to the server such that the server calls the client? In other words do any of your client classes implement a remote interface?

This is the only explanation I can think of for the server connecting to the client for DGC. If there are no callbacks the only DGC connections would be from client to server and they would most likely reuse the same ports that the remote objects are already listening on so they should go through your firewall as is.

 

 

Thank you


I didn't have any purpose of implementing remote interface in the client classes.
I will check my codes right now more closely.
Thank you very much.