To stop all ongoing deployments manually: from the Details tab, click Halt Deployments.

The Details tab also contains a Critical Reset button, which you can use to delete the last deployment to the given target (the current deployment). The operation clears the deployment state one by one from each agent, deleting the deployment data directories from the ATG asset management server and the target. All agents are reset to IDLE. Typically you use the Critical Reset operation only in situations where errors occurred that are irrecoverable by stopping the deployment, fixing the error, and either resuming or rolling back the deployment.