ssh “permissions are too open” error

Keys need to be only readable by you: If Keys need to be read-writable by you: 600 appears to be fine as well (in fact better in most cases, because you don’t need to change file permissions later to edit it). The relevant portion from the manpage (man ssh)

Hata!: SQLSTATE[HY000] [1045] Access denied for user 'divattrend_liink'@'localhost' (using password: YES)