On Windows, open Task Manager and confirm that the following processes are running: enfStarterSvc.exe and enfNodeServer.exe.

On Mac OS X and Linux, execute the following command line:
ps ax | grep enf
Confirm that the following process is running: enfnodeserver.

If the enfnodeserver process is not running, check out the enfnodeserver process section.

If the enfnodeserver process is running, confirm that the node is not working, using the EnFuzion Web.

If the enfnodeserver process is running, but the node is not working, then the Node is not connecting to the EnFuzion Root. Check out the section on Node is not connecting.