If using jconsole (or any other JMX-compliant client), consider reusing the standard JMX Connector Server that is started with server startup.
When the server starts up, a line similar to the one shown below appears in the server.log. You can connect to the JMXService URL specified there and perform the same management/configuration operations after successfully providing the credentials; for example:
[#|2004-11-24T17:49:08.203-0800|INFO|sun-appserver-ee8.1| javax.enterprise.system.tools.admin|_ThreadID=10;|ADM1501: Here is the JMXServiceURL for the JMXConnectorServer: [service:jmx:rmi:///jndi/rmi://hostname:8686/management/ rmi-jmx-connector]. This is where the remote administrative clients should connect using the JSR 160 JMX Connectors.|#]
For more information, refer to the Sun GlassFish Enterprise Server 2.1 Administration Guide.