Non-working portscan denial test

gistfile1.yml

- name: test csf | Port scans are denied
  connection: local
  sudo: no
  # doalarm runs a command and returns an error if no output was captured in
  # 3 seconds
  # Here, a portscan is attempted; CSF should hang the connection, so doalarm() should
  # return an error
  command: doalarm () { perl -e 'alarm shift; exec @ARGV' "$@"; } && doalarm 3 nc -z 192.168.111.111 1-1023
  register: portscan_result
  failed_when: portscan_result.stdout