Redirect to a Multi-site Install Failing
From the looks of your folder structure you're missing the most important file for a multisite install...sites.php.

Copy example.sites.php to sites.php, edit it to add all sites in the installation to their respective paths, and try again...it should work.

These are the code samples example.sites.php for convenience:

// URL: http://dev.drupal.org
$sites['dev.drupal.org'] = 'example.com';

// URL: http://localhost/example
$sites['localhost.example'] = 'example.com';

// URL: http://localhost:8080/example
$sites['8080.localhost.example'] = 'example.com';

// URL: http://www.drupal.org:8080/mysite/test/
$sites['8080.www.drupal.org.mysite.test'] = 'example.com';


The format is:

'&lt;port&gt;.&lt;domain&gt;.&lt;path&gt;' =&gt; 'directory'