I've set up a MU install with two domains, using the WordPress MU Domain Mapping-plugin.
The system is first configured with subdomain d2.domain1.com (under sitesand then mapped
domain2.com to d2.domain1.com
The following settings in domain mapping are checked: Remote Login, Permanent redirect, User domain mapping page, Redirect administration pages to site's original domain
My problem is that I can't access the admin from domain2.com/wp-admin - it just gives me this error:
Now The domain mapping plugin only works if the site is installed in /. This is a limitation of how virtual servers work and is very difficult to work around.
But the wordpress IS installed in /.
Relevant wp-config below:
define( 'MULTISITE', true );
define( 'SUBDOMAIN_INSTALL', true );
// $base = '/';
define( 'DOMAIN_CURRENT_SITE', 'domain1.com' );
define( 'PATH_CURRENT_SITE', '/' );
define( 'SITE_ID_CURRENT_SITE', 1 );
define( 'BLOG_ID_CURRENT_SITE', 1 );
define( 'NOBLOGREDIRECT', 'http://domain1.com' );