Having trouble logging into my wp-login.php on my terminal

Good day all.

I’ve been using WP on my site https://www.neotokyoproject.com for close to 9 months now. It was working perfectly fine until 3 days ago, when suddenly I started experiencing a 406 Error, Not Allowed.

Subsequently, I did a repair of the files, and also replaced all the files except my wp-content folder and wp-config.php with a clean suite of files in an attempt to fix the issue.

Right now, I’m still having trouble accessing the backend of my site. Whenever I try to log in to the wp-login.php, it instead gives me a blank page and doesn’t load up.

This problem however seems isolated only to my desktop system, and it appears as if something is blocking my system (and only this system) from accessing the wp-login.php and other related pages.

Has anybody encountered this issue before, and if so, please advise?

Thanks and regards.