On 21 Aug 2008, at 09:25, Mark Thomas wrote:
Bill Davidson wrote:
I've been through the docs. I've been through Google. I can't seem
to figure this out.
Server: Tomcat 6.0.18, JDK: 1.6.0_07, Redhat Server 5.2
Client: jconsole from JDK 1.6.0_07 on Windows XP
I've got all of these in $CATALINA_OPTS and they do show up in
the java command line when I run ps:
-Dcom.sun.management.jmxremote
-Dcom.sun.management.jmxremote.port=12345
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false
The Redhat server is running iptables and disallows most things that
aren't 80/443. Any other ports that are needed are generally opened
up only to specific IP's.
I've opened up the JMX port specified above on the Linux firewall:
iptables -A INPUT -s myClientsIp -p tcp -m tcp --dport 12345 -j
ACCEPT
I run jconsole:
C:\PathToJava\bin>jconsole myServer.myDomain.com:12345
It can't make the connection. I've got a feeling it's something to
do with
the firewall. I've seen some stuff that suggests that there's
another
unspecified port opened up but it didn't really make sense to me.
Note that the server and the client are at different facilities
connected
over the internet which is why I eventually want to get it going with
authentication and SSL but I can't even get this simple insecure
version of the connection to work.
Add some logging to your firewall configuration to see what is being
dropped.
That should help, but it's likely to be a different port in use each
time. Because JMX uses RMI by default, and RMI uses two ports: a
fixed port to initiate the connection and then a secondary (random)
port for data transfer. This is a real pain to get working.
-Dom
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