Here is what Inmotion said:, Reviewing the provided error I am seeing that the function is being blocked by Mod Security due to “POST to wp-login.php without redirect_to”
Did the popup login form from menu header change? I’ve never paid attention to it because it just worked as required 🙂 However, no one can login the way they have been used to logging in to the system.
Any help in understanding this form and how I might resolve this issue is greatly appreciated.