Hi,
Sorry to interrupt this old post but no one replied on this thread so i am explaining little bit about 401 wp-admin error in wordpress.
We are facing this error when we enter incorrect password in wordpress admin and to resolve this issue you can follow below details
1. Try to remove password from WordPress admin – It’s a temporary dealing!
2. Just clear the cache appeared in Firewall
3. Do the activity of plugin deactivation
4. Choose the WordPress Default Theme
5. Reset the password of WordPress
6. Do you still have query then contact the provider of WordPress hosting company
If you want to check more details about this error then you can check this link: https://hoststud.com/resources/steps-to-fix-401-unauthorized-error-in-wordpress.665/
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