Como esperar pela reinicialização do servidor usando o Ansible?

Estou tentando reiniciar o servidor e aguarde, usando o seguinte:

- name: Restart server
  shell: reboot

- name: Wait for server to restart
  wait_for:
    port=22
    delay=1
    timeout=300

Mas eu recebo este erro:

TASK: [iptables | Wait for server to restart] ********************************* 
fatal: [example.com] => failed to transfer file to /root/.ansible/tmp/ansible-tmp-1401138291.69-222045017562709/wait_for:
sftp> put /tmp/tmpApPR8k /root/.ansible/tmp/ansible-tmp-1401138291.69-222045017562709/wait_for

Connected to example.com.
Connection closed

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