I use wordpress 4.9.6 and civiCRM 5.1.2 for wordpress in my cPanel: string command:
https://mysite/wp-content/plugins/civicrm/civicrm/bin/cron.php?name=username&pass=password=curl '[string site-key]'
message mail: You need to send a valid key to execute this file. Why my key it's not valid? I took the key in cvicrm.settings.php Thanks