Ansible fails to connect with SSH (banner exchange)

Try to use ansible_user instead ansible_ssh_user and ansible_password instead ansible_ssh_pass. It depends of your ansible version. Also you may need to place [group:vars] after [group] section in the inventory file.

There is simple way to check difference

ansible 192.168.15.29 -i your_hosts_file -m ping -e "ansible_ssh_user=remote ansible_ssh_pass=password"

or

ansible 192.168.15.29 -i your_hosts_file -m ping -e "ansible_user=remote ansible_password=password"