Do you have a simple test program to see if c-treeRTG is working?

The attached program, called ctreecheck.cbl, will return an error 19:133 if c-treeRTG isn't running.

If the server is running in Windows, you may see the c-treeRTG icon in the taskbar's tray on the right-hand side.

You can also check the services, if you installed c-treeRTG as a service.

If the server is running in Linux you can check the port you normally start c-treeRTG on, to see if the daemon is running.
Often the command for this in Linux is netstat -nlp | grep 5597 (if you started c-treeRTG on the default port of 5597).