A previous command to change the problem determination mode of the console has already been entered.
VARY,CN ACTIVATE places the system console in problem determination mode and might be pending; the system ignores other VARY,CN ACTIVATE commands until the system console is deactivated. VARY CN,DEACTIVATE removes the console from problem determination mode and might be pending; the system ignores other VARY,CN DEACTIVATE commands until the system console is activated.
Use the DISPLAY CONSOLES command to see whether the system console is in problem determination mode and which attributes are in effect for the system console.
Communications task (COMMTASK)
IEECB854