Cacti redirecting to login always

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http://serverfault.com – I have just manually installed Cacti 0.8.8a on a Debian 6 box with NginX 1.2.0 & PHP5-FPM 5.3.20 After going to through the initial cacti-PHP install config checks, I was brought to the login page and attempted to log in with the default admin/admin only to be redirected back to the login form. I can see in the cacti log file that each log in was successful: AUTH LOGIN: User 'admin' Authenticated. For each log-in attempt, I get the following in my NginX access log: <server> <ip> - [26/Feb/2013:12:06:57 +0000] "GET /cacti/ HTTP/1.1" 200 1480 "-" "Mozilla/5.0 (X11; Ubuntu; Lin (HowTos)