I have a few separate WordPress MultiSite (WPMS) installations that I've been using for testing. In most instances except for the current test, I can access /wp-login/, /admin/, /wp-admin/, but on the other hand, some installations lead to a blank page when accessing /admin/.
I installed using https :// www., which to my relief, made the whole website load using HTTPS by default. I was preparing for using one of those HTTPS Plugins to force HTTPS site-wide - I'm glad I won't need to depend on a Plugin as such given I've got plenty of other Plugins to install.
However, I suspect that installing WPMS over HTTPS has resulted in /wp-login/ leading to a 404 Error / Not Found. I was expecting to be forwarded to /wp-login.php?redirect_to= OR /wp-login/ to load the page.
UPDATE: After 4 tests and installations, the fact is two sites load /wp-login/, whilst others throw a 404 and require /wp-login.php. Installing using HTTPS or HTTP is irrelevant. Seems to be a Permissions related issue. Two installations accept /wp-login/, other 2 require /wp-login.php.
Are these Admin URL inconsistencies indicative of misconfiguration in CHMOD File Permission?
My WPMS Network settings are:
Domain, Siteurl, Home: https :// www.mydomain.org.uk
Related wp-config.php settings: