Couldn't resolve host 'cdk-builds.usersys.redhat.com'
<p>While installing vagrant i'm getting following error....
I'm following <a href="https://fabric8.io/guide/getStarted/cdk.html" rel="nofollow">https://fabric8.io/guide/getStarted/cdk.html</a> for installation.</p>

<pre><code>pwd

/Users/apple/openshift-vagrant/cdk-v2

vagrant up

Bringing machine 'cdk' up with 'virtualbox' provider...
==&gt; cdk: Box 'cdk_v2' could not be found. Attempting to find and install...
    cdk: Box Provider: virtualbox
    cdk: Box Version: &gt;= 0
==&gt; cdk: Box file was not detected as metadata. Adding it directly...
==&gt; cdk: Adding box 'cdk_v2' (v0) for provider: virtualbox
    cdk: Downloading: http://cdk-builds.usersys.redhat.com/builds/nightly/27-May-2016/rhel-7-cdk-vagrant-scratch-7.2.27052016-1.x86_64.vagrant-virtualbox.box
An error occurred while downloading the remote file. The error
message, if any, is reproduced below. Please fix this error and try
again.

Couldn't resolve host 'cdk-builds.usersys.redhat.com'
</code></pre>

<p>any idea ?</p>