Passenger 5/6 requires a config.ru file to run Rails 2.3 projects
Put the following into config.ru in your Rails root folder:
# Require your environment file to bootstrap Rails
require ::File.dirname(__FILE__) + '/config/environment'
# Dispatch the request
run ActionController::Dispatcher.new
Otherwise, your Rails 2.3 project will not be considered by Passenger 5+ and you will probably see 403 errors returned by nginx or Apache.
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