Can't Login into the WordPress Admin Panel

Hello,

I can’t login to my wordpess admin panel, I get 404 error page not found..

This error appeared all of a sudden, I haven’t moved my site. I was able to login before.
All the directories and files are there.

Here’s my .htaccess file, if needed.

RewriteEngine on
RewriteCond %{REQUEST_URI} ^/wp-login\.php(.*)$ [OR]
RewriteCond %{REQUEST_URI} ^/wp-admin$
RewriteCond %{REMOTE_ADDR} !^123\.123\.123\.123$
RewriteRule ^(.*)$ . [R=403,L]
#deny from all
# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
RewriteCond %{REQUEST_FILENAME} !-f
RewriteCond %{REQUEST_FILENAME} !-d
RewriteRule . /index.php [L]
</IfModule>

# END WordPress

I’ll appreciate your help.
Regards!