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POJava jconsole jmx connection failure
 

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    <p>I'm trying to connect jconsole to a jvm invoked by:</p> <pre><code>java \ -Djava.util.logging.config.file=./logging.properties \ -Dcom.sun.management.jmxremote.ssl=false \ -Dcom.sun.management.jmxremote.authenticate=false \ -Dcom.sun.management.jmxremote.port=12700 \ -cp . Sleep </code></pre> <p>I then try to start jconsole with:</p> <pre><code>jconsole -J-Djava.util.logging.config.file=./logging.properties </code></pre> <p>The loggin.properties file includes:</p> <pre><code>sun.rmi.level=FINEST </code></pre> <p>After opening a socket to port 12700, rmi then appears to attempt a connection on another port :</p> <pre><code>FINER: [javax.management.remote.rmi.RMIConnector: jmxServiceURL=service:jmx:rmi:///jndi/rmi://10.40.243.12:12700/jmxrmi] connecting... Jan 5, 2012 2:30:42 PM RMIConnector connect FINER: [javax.management.remote.rmi.RMIConnector: jmxServiceURL=service:jmx:rmi:///jndi/rmi://10.40.243.12:12700/jmxrmi] finding stub... Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPEndpoint &lt;clinit&gt; FINE: JConsole.addHost: localHostKnown = true, localHost = 10.206.6.59 Jan 5, 2012 2:30:43 PM sun.rmi.server.UnicastRef newCall FINE: JConsole.addHost: get connection Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPTransport &lt;init&gt; FINE: JConsole.addHost: Version = 2, ep = [10.206.6.59:0] Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPEndpoint getLocalEndpoint FINE: JConsole.addHost: created local endpoint for socket factory null on port 0 Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPChannel createConnection FINE: JConsole.addHost: create connection Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPEndpoint newSocket FINER: JConsole.addHost: opening socket to [10.40.243.12:12700] Jan 5, 2012 2:30:43 PM sun.rmi.transport.proxy.RMIMasterSocketFactory createSocket FINE: JConsole.addHost: host: 10.40.243.12, port: 12700 Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPChannel createConnection FINER: JConsole.addHost: server suggested 10.206.6.59:12306 Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPChannel createConnection FINER: JConsole.addHost: using 10.206.6.59:0 Jan 5, 2012 2:30:43 PM sun.rmi.server.UnicastRef newCall FINER: JConsole.addHost: create call context Jan 5, 2012 2:30:43 PM sun.rmi.server.UnicastRef logClientCall FINER: JConsole.addHost: outbound call: [endpoint:[10.40.243.12:12700](remote),objID:[0:0:0, 0]] : sun.rmi.registry.RegistryImpl_Stub[0:0:0, 0]: java.rmi.Remote lookup(java.lang.String) Jan 5, 2012 2:30:43 PM sun.rmi.transport.StreamRemoteCall &lt;init&gt; FINER: JConsole.addHost: write remote call header... Jan 5, 2012 2:30:43 PM sun.rmi.transport.StreamRemoteCall getOutputStream FINER: JConsole.addHost: getting output stream Jan 5, 2012 2:30:43 PM sun.rmi.server.UnicastRef invoke FINER: JConsole.addHost: execute call Jan 5, 2012 2:30:43 PM sun.rmi.transport.StreamRemoteCall getInputStream FINER: JConsole.addHost: getting input stream Jan 5, 2012 2:30:43 PM sun.rmi.server.LoaderHandler loadClass FINE: JConsole.addHost: name = "javax.management.remote.rmi.RMIServerImpl_Stub", codebase = "", defaultLoader = sun.misc.Launcher$AppClassLoader@a39137 Jan 5, 2012 2:30:43 PM sun.rmi.server.LoaderHandler loadClass FINER: JConsole.addHost: class "javax.management.remote.rmi.RMIServerImpl_Stub" found via defaultLoader, defined by null Jan 5, 2012 2:30:43 PM sun.rmi.server.LoaderHandler loadClass FINE: JConsole.addHost: name = "java.rmi.server.RemoteStub", codebase = "", defaultLoader = sun.misc.Launcher$AppClassLoader@a39137 Jan 5, 2012 2:30:43 PM sun.rmi.server.LoaderHandler loadClass FINER: JConsole.addHost: class "java.rmi.server.RemoteStub" found via defaultLoader, defined by null Jan 5, 2012 2:30:43 PM sun.rmi.server.LoaderHandler loadClass FINE: JConsole.addHost: name = "java.rmi.server.RemoteObject", codebase = "", defaultLoader = sun.misc.Launcher$AppClassLoader@a39137 Jan 5, 2012 2:30:43 PM sun.rmi.server.LoaderHandler loadClass FINER: JConsole.addHost: class "java.rmi.server.RemoteObject" found via defaultLoader, defined by null Jan 5, 2012 2:30:43 PM sun.rmi.server.UnicastRef done FINE: JConsole.addHost: free connection (reuse = true) Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPChannel free FINE: JConsole.addHost: reuse connection Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPChannel free FINE: JConsole.addHost: create reaper Jan 5, 2012 2:30:43 PM sun.rmi.server.UnicastRef newCall FINE: JConsole.addHost: get connection Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPChannel createConnection FINE: JConsole.addHost: create connection Jan 5, 2012 2:30:43 PM sun.rmi.transport.tcp.TCPEndpoint newSocket FINER: JConsole.addHost: opening socket to [tdiap12:41096] Jan 5, 2012 2:30:43 PM sun.rmi.transport.proxy.RMIMasterSocketFactory createSocket FINE: JConsole.addHost: host: tdiap12, port: 41096 </code></pre> <p>The first connection attempt succeeds because on the remote server, I can see ESTABLISHED connection.</p> <pre><code>wse2tst@tdiap12:~&gt; netstat -a | grep 12700 tcp 0 0 *:12700 *:* LISTEN tcp 0 0 tdiap12.vgcar.net:12700 per-00c0016253a2.vgca:12252 ESTABLISHED </code></pre> <p>The packet trace indicates a successful connection as well.</p> <p>The second connection to port 41096 times out, and the jconsole application reports a "Connection failure" and terminates the first connection as well. Why is a second connection being attempted? Is there any way to specify the port for this second connection? The target server is tightly controlled, and other ports are blocked by firewall rules. On multiple connection attempts, the second port will change to different random values.</p> <p>Thanks for any help, Steve</p>
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    1. COare you sure no firewalls on your machine blocking 12700? I suspect because of some blocking, jmx trying alternative port. Try by disabling your firewall.
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    2. COWhen I try to connect from my local machine, the remote machine shows the following:`wse2tst@tdiap12:~> netstat -a | grep 12700 tcp 0 0 *:12700 *:* LISTEN tcp 0 0 tdiap12.vgcar.net:12700 per-00c0016253a2.vgca:12252 ESTABLISHED ` I'm assuming the connection is being established and is not being blocked by a local firewall rule. The packet trace also indicates that the connection is successful.
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    3. COI guess you need to add -Dcom.sun.management.jmxremote while bringing up the jvm you specified on top of this question, don't we need to?
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