On occasion something may break your login access to your WordPress site. For me this has usually been do to a plugin problem after and update. The login page may not load or you may even get a cookies need enable error.
To fix the issue:
Log into your hosting site as root.
Go to the directory you install word press into. Possibly: /var/www/html/wordpress
Go to /wp-contents/
mv plugins/ oldplugins
chmod 705 plugins/
You can now log into your wordpress site.
Once logged in:
cp -R oldplugins/* plugins/