Last modified: 2012-05-03 03:09:04 UTC
I have a single domain with six wikis, with the URL being $wgServer/$wgDBname. I set $wgCentralAuthCookies=true, but logins did not "stick" - once I clicked another link after logging in to a wiki, and it showed me as logged out. This occured on all wikis, 3 of which use 1.18.0 and 3 of which use 1.20alpha. The extension developer told me that my configuration was correct, so I knew it had to be my webserver. Enabling/disabling anonymous authentication and forms authentication (separately and together) did not solve the issue.
Further information: PHP is 5.3.11 cgi-fcgi, MySQL 5.5.9.
Forgot to configure a shared objectcache table.