I recently upgraded to WPMU 2.8.6 and ever since, my users can't log in on their individual blogs, but they can log in from the main page.
My site is at blogs.mtwp.net (we're a school district).
So if a user goes to blogs.mtwp.net/BLOGNAME/wp-login.php, their password is rejected. If they go to blogs.mtwp.net/wp-login.php, they can log in and get to the dashboard from there.
But it's not all users. Site admins can get in just fine.
We're using wpDirAuth 1.4 if that makes a difference.
Honestly, I'm stumped. Any help would be very much appreciated. Thanks!
you would seem to have enabled the WPdirauth plugin at the top level blog but not on others. Only your top level blog will have the necessary information to connect to your directory.
Site admins are not typically part of your internal directory - they're a Wordpress user which means they can still log-in ok without needing to connect to Active Directory or whatever you're using.
Enable WPdirauth on all blogs that you need users to login to.