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My Tomcat 7 process, which I run on a server on Amazon EC2, has settings such as these in CATALINA_OPTS which should allow me to connect for JMX monitoring remotely:

-Dcom.sun.management.jmxremote.port=8086
-Dcom.sun.management.jmxremote.ssl=false
-Dcom.sun.management.jmxremote.authenticate=false

However, connecting remotely does not work with either jconsole or jvisualvm. It just times out.

I've triple-checked that the EC2 security group allows access to the JMX remote port from my IP (and only from my IP).

Are there any settings missing?

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Specify the java.rmi.server.hostname option too, so that it points to the public DNS name of your EC2 server:

-Djava.rmi.server.hostname=your.public.dns

That was sufficient to get it working for me, but for more tips, try this blog post:
JMX Monitoring on Amazon EC2

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