Google led me to this page: http://lauragentry.com/blog/2012/01/05/when-wordpress-network-subdomain-blogs-wont-let-you-log-in/
There’s a chunk of code in there that I added to my wp-config.php file, to wit:
define('ADMIN_COOKIE_PATH', "https://wordpress.stackexchange.com/");
define('COOKIE_DOMAIN', '');
define('COOKIEPATH', '');
define('SITECOOKIEPATH', '');
What I don’t quite understand is why this works. Anyone know?
Updated It doesn’t completely work — I can now log in to the subdomains, but not the root domain.
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