WP Multisite + SSL gives 404 on wp-admin

Question

I have installed SSL certificate on my server via DirectAdmin. This seems to be working well.

I've changed my url's in the wp_*_options tables to https://mydomain.nl and such. Suddenly my wp-admin stopped working, its just redirecting from https://mydomain.nl/wp-admin/ to https://mydomain.nl/not_found showing me the 404 page from my theme.

How can I debug this to find the issue?

Answer 1

You can force admin area to SSL connection by defining following code in wp-config.php

 define('FORCE_SSL_ADMIN', true);