Everything was working fine on my Confluence instance. Anonymous users could access all appropriate pages. I recently updated to the latest 6.15.1 and after it started back up, it was prompting for a login on all pages other than the main page.
I followed all instructions on https://confluence.atlassian.com/doc/setting-up-public-access-156.html to double check and make sure anonymous access was enabled globally as well as on the space. I disabled and then re-enabled to make sure it wasn't just a caching issue, but all pages are still prompting for login.
Anyone have any ideas what might be going wrong?