Why Java RMI Callback doesn't work behind NAT router? -

Why Java RMI Callback doesn't work behind NAT router? -

i'm trying callback on java rmi simple program, , works ok in localhost , lan, have problems doing behind nat router.

i connection refused if server implementation extends unicastremoteobject. if don't extends unicastremoteobject , export object manually (unicastremoteobject.exportobject(services, 0);), server action when client calls remote method, , when server calls callback method, gets connection timeout because phone call going private ip.

i bind service in registry this:

public class server { private static final string srvhost = "<<external ip>>"; private static registry registry; public static void main(string[] args) { system.setproperty("java.rmi.server.hostname", srvhost); system.setproperty("java.rmi.server.usecodebaseonly","false"); system.setproperty("java.security.policy","src/srv.policy"); if(system.getsecuritymanager()==null) system.setsecuritymanager(new rmisecuritymanager()); registry = locateregistry.createregistry(registry.registry_port); serverinterface services = new serverimpl(); registry.rebind("serverapi", services); } }

and client gets service:

public class client { private static final string srvhost = "localhost"; private static registry registry; private static clientinterface callback; public static void main(string[] args) { system.setproperty("java.security.policy", "src/cli.policy"); if(system.getsecuritymanager()==null) system.setsecuritymanager(new rmisecuritymanager()); registry = locateregistry.getregistry(srvhost, registry.registry_port); serverinterface services = (serverinterface) registry.lookup("serverapi"); callback = new clientimpl(); int ncallback = services.setclientinterface(callback); ... <<do_things>> } }

the method setclientinterface(...) gets client object , stores in arraylist.

i don't know what's problem. can help me?

all code published here:

policy files:

srv.policy - http://pastebin.com/ltsksg3r

cli.policy - http://pastebin.com/zqxaryt3

package: com.rmicallback.client

client.java - http://pastebin.com/xus04jzk

clientimpl.java - http://pastebin.com/sdqxmdzs

clientinterface.java - http://pastebin.com/s9pxt5vc

package: com.rmicallback.server

server.java - http://pastebin.com/cxqcwy1q

serverimpl.java - http://pastebin.com/nqdgpbpr

serverinterface.java - http://pastebin.com/npxdjgs1

java rmi router nat behind