I can't access wp-admin at all after changing wp-config folder permission for hardening my security. The content for the site load find, I cant access wp-admin at all, all I get is 404 message.
type in domain.com/wp-login.php
Dashboard -> Settings -> Permalinks -> Save. (just automatically recreates your .htaccess again).
If the problem persists. Try disabling plugins. Enable plugins 1 by 1 until the problem occurs again. That will narrow down the faulty plugin.
If ALL you did was to change wp-config.php permissions, look on your folder (or on a fresh WP folder) for
wp-config-sample.php, make a copy of it, and fill in the database connection lines again.
Then rename wp-config to
wp-config-OLD.php and the copy of wp-config-sample to
wp-config.php and you should be fine.
Don't delete .htaccess as it may include changes by other plugins like cache creators - at least copy it to .htaccess_bak
It should not be necessary to delete it.
go to yourdomain.com/wp-login.php and login. This should work.
Now rebuild the permalinks: Settings -> Permalinks -> Save
Log out and try again with yourdomain.com/wp-admin
I have to do this every second months, god knows why