Stopping APPC/MVS, ASCH, and DFM

The following examples stop APPC/MVS, ASCH, and DFM:

  CANCEL APPC
  CANCEL ASCH
  CANCEL DFM

You should consider the following before using the CANCEL command:

Before cancelling DFM, first cancel all jobs servicing APPC/MVS conversations, for example JOBNAME GDEDFM. Otherwise, the jobs abend when they try to access DFM resources.
Each time DFM is cancelled, the system marks the address space in which it was running as nonreusable until the next IPL.
Cancelling APPC, ASCH, or DFM immediately ends all TPs and scheduling activity for APPC/MVS, which could have serious repercussions.

Note: 13E abends can occur during CANCEL command processing. These abends are perfectly normal and do not interfere with the CANCEL command processing.