I had a similar error getting 405. I found I hadn't set the PassengerRoot directory correctly in the puppetmaster vhost config:
PassengerRoot /usr/lib/ruby/gems/1.8/gems/passenger-4.0.48 -- You received this message because you are subscribed to the Google Groups "Puppet Users" group. To unsubscribe from this group and stop receiving emails from it, send an email to puppet-users+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/puppet-users/df4b44ad-e1bc-484f-9e6c-259e31b4fbaa%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
