How to disable all logins except Network login in WordPress Multi site?

Question

I have N number of sites in WordPress multi-site. I want to restrict individual site login i.e.,

• http://www.example.com/site1/wp-admin
• http://www.example.com/site2/wp-admin

Only Network admin can access website/add content. i.e. only Network admin URL should be accessible: http://www.example.com/wp-admin. If possible all other login URLs should redirect to respective home pages. Is there any functions or .htaccess rule to achieve this?

.htaccess file:

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteRule ^index\.php$ - [L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]
</IfModule>
# END WordPress

Answer 1

You can try something like the following at the very top of your .htaccess file in the document root (before the WordPress front-controller, ie. before the # BEGIN WordPress block):

RewriteRule ^([\w-]+/)wp-admin /$1 [R,L]

This will redirect /<site>/wp-admin to /<site>/ - where the site name can consist of any of the characters a-z, A-Z, 0-9, _ and -.

http://www.example.com/wp-admin is accessible as normal.

Yes its working, if wordpress is in sub directory its not working.

If the WordPress .htaccess file is in a subdirectory then you will need to modify the directive like so:

RewriteRule ^wp-admin /subdirectory/ [R,L]

However, your setup is still unclear. Do you have multiple .htaccess files for different WordPress installs? A single multi-site .htaccess in a subdirectory and no other .htaccess files?