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I activated multisite using subdirectories on my old WordPress site, and I created a new site (say my-example.com/new-site/).

I found links such as my-example.com/new-site/wp-content/mu-plugins/css/ can redirect to my-example.com/wp-content/mu-plugins/css/, however, my-example.com/new-site/wp-content/mu-plugins/css/style.css won't redirect and will throw out a 404 error, this leads to the site loading errors.

I was so confused, and tried hard refreshing sites, clearing cookies, but it didn't work.

The .htaccess file

# BEGIN WordPress
<IfModule mod_rewrite.c>
RewriteEngine On
RewriteBase /
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
  • "my-example.com/new-site/wp-content/mu-plugins/css/ can redirect to my-example.com/wp-content/mu-plugins/css/" - I'm not sure what you mean by that? There should be no "redirect" occurring here? – MrWhite May 8 at 10:53
  • 1
    @MrWhite According to rule RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L], the redirect will occur. – Guoyang Qin May 8 at 17:53
1

After trying a million of ways, I contacted the super admin and asked for permission to log into WP Engine, our host. I found there is a Multisite setting too. So I clicked "convert to multisite", and, bang! the error is resolved. Subsites can work properly now.

enter image description here

  • Thanks for the feedback. I wonder what that "magic switch" did? – MrWhite May 8 at 21:22
  • 1
    @MrWhite I guess it has something to do with the Nginx reverse proxy, which may override my .htaccess redirect for .css/.js static files and causes error for loading those files. Setting multisite on WP Engine may alter the setting of Nginx and make it work. – Guoyang Qin May 8 at 21:30

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