I have a multisite installed with the domain mapping plugin.
All the domains work fine, except...
One of the sites is on a subdirectory (the main site running Magento).
I added a symlink to the original installation directory in the WP subdirectory (
/wp/ in my case) because I needed to change the
.htaccess file for a different rewrite base.
The issue is that the
wp-admin does not work. Upon login, the page refreshes (with
redirect_to= in the URL) and then nothing happenes.
Upon further research, I've noticed that the cookie the site tries to set is for the parent site domain...