We've had a stable blog running for several months now. Yesterday attempts to access the admin system began failing, returning endless redirect loop messages in Firefox. Looking at the process through the TamperData plugin I'm seeing it bouncing with 302 status codes between wp-login.php and wp-admin/ anytime I try to hit wp-admin.
Other pertinent bits:
- The front end of the blog, all the public content, works fine, it's only the admin side which is effected
- The site is not using .htaccess redirects and the site url setting matches the blog url setting.
- Nothing on the server itself has changed and other WP sites hosted on the same server work just fine.
The other redirect problem related posts I'm seeing talk about conflicts between the site and blog url or problems where the admin side works but not the front end.
Any suggestions on where I should be looking for the source of this?