Use the MODIFY operator command to stop global tracing. For example, your FTP jobname is FTPD1. You can issue the F FTPD1,DEBUG=(NONE) command to stop global tracing. Previously established FTP connections that were started with tracing enabled continue to produce trace output until the connections are terminated, but new connections start without tracing enabled.

If you have coded DEBUGONSITE TRUE in the server's FTP.DATA, the FTP client can use a SITE DEBUG=NONE command to stop tracing. The SITE command affects only tracing for the current FTP session.