After moving an existing rails 2.2 app to a new server, the app is now using a cookie session instead of an active record session. The old server is still running using the same repo and an active record session.
The session_store is being set properly in environment.rb and we can see Rails is loading the setting in Rails.configuration.
Any thoughts?
Answering my own question, there is a compatibility issue with rails 2.2 and phusion passenger 5. The solution is to upgrade to rails 2.3 or downgrade to passenger 4.