First, we need to disable Admin Tools. You can use the instructions here
to do that, look at the "Using FTP to regain access to your site's administrator" instruction.
Now you can log in. You need to unblock the server's IP address. There may be a large "Unblock my IP" button at the top of the Admin Tools screen. If it's there, that will do it.
Then go to Web Application Firewall, Configure WAF, on the first tab, flip the value in "Enable IP workarounds", if it is Yes, make it No or vice versa.
Now you can rename the main.php file that you renamed above to enable Admin Tools again.
Dale L. Brackin
Please keep in mind my timezone and cultural differences when reading my replies. Thank you!
My time zone is EST (UTC -5) (click here to see my current time in Philadelphia, PA)