Warden doesn't bind to a public IP address by default

[fmitchell-r7]

Warden binds to localhost by default, which makes it hard to use out of the box with Tokend. We should either change the default attributes in the cookbook to bind to the node's IP address

node['warden']['config']['service']['hostname'] = node['ipaddress']

or change the default configuration to bind to 0.0.0.0.

{
  "service": {
    "hostname": "0.0.0.0"
  }
}