Rename dispatch.fcgi and routing stops working

I would like to rename dispatch.fcpi to host1_dispatch.fcgi,
host2_dispatch.fcgi, etc in order to allow Switchtower to kill the
right fcgi dispatch processes on deployment. But when I rename
dispatch.fcgi routing to the controllers stops working, any ideas why
this file name is important?

ActionController::RoutingError (Recognition failed for “”):
/usr/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/routing.rb:469:in
recognition_failed' /usr/lib/ruby/gems/1.8/gems/actionpack-1.11.2/lib/action_controller/routing.rb:459:inrecognize!’
/usr/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/dispatcher.rb:38:in
dispatch' /usr/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/fcgi_handler.rb:141:inprocess_request’
/usr/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/fcgi_handler.rb:53:in
process!' /usr/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/fcgi_handler.rb:52:ineach_cgi’
/usr/lib/ruby/1.8/fcgi.rb:597:in each' /usr/lib/ruby/1.8/fcgi.rb:597:ineach_cgi’
/usr/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/fcgi_handler.rb:52:in
process!' /usr/lib/ruby/gems/1.8/gems/rails-1.0.0/lib/fcgi_handler.rb:22:inprocess!’
jonsmirl_dispatch.fcgi:37


Jon S.
[email protected]