Ansible tower upgrade fails with error failed to connect to the host via ssh: Connection timed out during banner exchange"

Issue

• Ansible tower upgrade fails with error failed to connect to the host via ssh: Connection timed out during banner exchange"

  TASK [repos_el : Install the Tower bundle repository] **************************
  ok: [tower.example.com] => {"changed": false, "checksum": "3640f929e53b35403388cec7edda2362f1fdec64", "dest": "/etc/yum.repos.d/ansible-tower.repo", "gid": 0, "group": "root", "mode": "0640", "owner": "root", "path": "/etc/yum.repos.d/ansible-tower.repo", "secontext": "system_u:object_r:system_conf_t:s0", "size": 455, "state": "file", "uid": 0}
  ok: [tower.example.com] => {"changed": false, "checksum": "3640f929e53b35403388cec7edda2362f1fdec64", "dest": "/etc/yum.repos.d/ansible-tower.repo", "gid": 0, "group": "root", "mode": "0640", "owner": "root", "path": "/etc/yum.repos.d/ansible-tower.repo", "secontext": "unconfined_u:object_r:system_conf_t:s0", "size": 455, "state": "file", "uid": 0}
  ok: [tower.example.com] => {"changed": false, "checksum": "3640f929e53b35403388cec7edda2362f1fdec64", "dest": "/etc/yum.repos.d/ansible-tower.repo", "gid": 0, "group": "root", "mode": "0640", "owner": "root", "path": "/etc/yum.repos.d/ansible-tower.repo", "secontext": "system_u:object_r:system_conf_t:s0", "size": 455, "state": "file", "uid": 0}
  ok: [tower.example.com] => {"changed": false, "checksum": "3640f929e53b35403388cec7edda2362f1fdec64", "dest": "/etc/yum.repos.d/ansible-tower.repo", "gid": 0, "group": "root", "mode": "0640", "owner": "root", "path": "/etc/yum.repos.d/ansible-tower.repo", "secontext": "system_u:object_r:system_conf_t:s0", "size": 455, "state": "file", "uid": 0}
  fatal: [tower.example.com]: UNREACHABLE! => {"changed": false, "msg": "Failed to connect to the host via ssh: Connection timed out during banner exchange", "unreachable": true}