Ian,
Use the Config tool and expand cluser-data -> instace_idxxxxx -> server_idxxx and left-click on this node.
In the right had pane you should see a bunch of tabs, the last one being debug. Check the Debugable checkbox and the Enable debug mode one.
Apply the settings from the File menu, then exit and restart the server process.
Cheers,
Steve
PS - Config tool is launched from go.bat in the directory
\usr\sap\J2E\JC00\j2ee\configtool\
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