COZUNLINK: Unlink failed. Manual intervention may be required.
Explanation: The forcible unlink of the pathname failed.
Action: There remains the option of manual intervention. One method is to use TSO. Assuming that the default pathname is in play, in four successive TSO panels, use the following commands:
3 Utilities Perform utility functions
17 Udlist Display z/OS UNIX directory list
Pathname . . . /var/log
D(elete) cozsftp.smf.soc