Login to WordPress dashboard will not work

Ensure you have the correct password. Keep login screen open and open a new tab.

Login into Cpanel or FTP.

Go to : public_html/wp-content/plugins

Rename all-in-one-wp-security-and-firewall to all-in-one-wp-security-and-firewallHOLD

login back into the site websitename.ca/wp-admin 

once logged into the Dashboard, Go back to cpanel change all-in-one-wp-security-and-firewallHOLD back to all-in-one-wp-security-and-firewall 

Reactivate the plugin in WordPress.