Q:

Vagrant port forwarding not working.  Cups not accesible from host

So I'm working with vagrant and I'm trying to use it as a printing server.  I installed cups. 
Internally everything works just fine.  I can even make a quick curl to my localhost:631 (cups port inside my vagrant) and there's everything.  
The thing is I cant access it in any way I try from the host machine. 
Obviously I forwarded the port and I've tried with several ports.  I've also tried with Debian squeeze and Ubuntu 12.04.  Here is my current Vagrantfile
Vagrant.configure("2") do |config|                                              
  config.vm.box = "guruDebian"
  config.vm.network :forwarded_port, guest: 80, host: 8080
  config.vm.network :forwarded_port, guest: 631, host: 6363   ## HERE IS CUPS           
end

Any ideas? 

A:

I think what you will find is that the default cups config file is locked down to only work from localhost for security reasons. 
Inside your Vagrant VM open the /etc/cups/cupsd.conf file and change the following line:
Listen localhost:631

to
Listen 0.0.0.0:631

That should allow you to connect from any host.