Ticket #43306: 43306.patch

wp-includes/ms-blogs.php

@@ -87 +87 @@
         $current_network = get_network();
         $slug            = trim( $slug, '/' );
 
-        $domain = $current_network->domain;
-        $path   = $current_network->path . $slug . '/';
+        if ( is_subdomain_install() ) {
+                $domain = $slug . '.' . preg_replace( '|^www\.|', '', $current_network->domain );
+                $path   = $current_network->path;
+        } else {
+                $domain = $current_network->domain;
+                $path   = $current_network->path . $slug . '/';
+        }
 
         $site_ids = get_sites(
                 array(