I found my problem. As I was running ansible with sudo (-s) parameter, my ssh-agent socket was forwarded for the regular user only. Then I need to add "sudo: yes" to all the tasks I need sudo and be sure the task where I run ssh to remote tasks has no sudo.
This link helped me to find the problem: https://github.com/ansible/ansible/issues/7235 Thanks -- You received this message because you are subscribed to the Google Groups "Ansible Project" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To post to this group, send email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/ansible-project/067ec060-971d-4cd7-a641-ebf212056838%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
