I was late approx 1 month to renew the domain then when I need to access WordPress admin page redirect to “not found,this is embarassing bla bla bla…”
Here My solution:
– Login to Cpanel -> File Manager -> go to your WordPress folder (usually under public html folder)
– Check the permission of wp-login.php. In my case while can not access the admin site the permission was 000, I change the permission of wp-login.php to 500 then problem solved, admin site can access back to normal.
Another usefull tips from WordPress codex if can not access WordPress admin page issue go here