Monitoring application with JConsole thows IOException in monitored application. This seems to be Ubuntu only issue.
Steps how to reproduce on clean install of Ubuntu 8.0.4:
1) Start Notepad with OpenJDK build 1.6.0_0-b11
java -jar /usr/lib/jvm/java-6-openjdk/demo/jfc/Notepad/Notepad.jar
2) start JConsole and attach to Notepad running on the same machine
3) The following exception is printed to console from Notepad:

01 Oct 2008 2:16:22 PM sun.rmi.transport.tcp.TCPTransport$AcceptLoop executeAcceptLoop
WARNING: RMI TCP Accept-0: accept loop for ServerSocket[addr=0.0.0.0/0.0.0.0,port=0,localport=37278] throws
java.io.IOException: The server sockets created using the LocalRMIServerSocketFactory only accept connections from clients running on the host where the RMI remote objects have been exported.
at sun.management.jmxremote.LocalRMIServerSocketFactory$1.accept(LocalRMIServerSocketFactory.java:89)
at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.executeAcceptLoop(TCPTransport.java:387)
at sun.rmi.transport.tcp.TCPTransport$AcceptLoop.run(TCPTransport.java:359)
at java.lang.Thread.run(Thread.java:636)