There are two primary components to review when troubleshooting System Debugger problems:
The properties of the debug hub are:
Ensure that the DEBUG HUB is active on your system. If it is not active, enter the command STRTCPSVR *DBG to start the server. Ensure that the system profile QPGMR has a minimum of *CHANGE authority to the QGPL library.
The properties of the debug server are:
Ensure that the DEBUG SERVER job is active on your system. If it is not active and the DEBUG HUB is active on your system, check the QTESDBGSVR job log for additional information. All instances of the QTESDBGSVR job are submitted to the QUSRNOMAX job queue, which feeds the QUSRWRK subsystem. To ensure that the debug server runs properly, make sure that the QUSRNOMAX job queue is not held and that the QUSRWRK subsystem is currently running. Also, ensure that the user profile specified when the graphical user interface is started has a minimum of *CHANGE authority to the QGPL library.