Tenten : Can't connect via SSH - Solved after reset

hi guys, i discovered the password but it doesn’t work via ssh . Tenten give me the response ‘Permission denied, please try again’. If i submit the id_rsa key, tenten says: “Permissions 0644 for ‘id_rsa’ are too open.
It is required that your private key files are NOT accessible by others.
This private key will be ignored.
Load key “id_rsa”: bad permissions”. Have you any other tricks ?
Should i reset the machine?