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

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?

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