<p>I can't seem to get a node to join the cluster. </p>

<pre><code>[discovery] Trying to connect to API Server "10.0.2.15:6443"
[discovery] Created cluster-info discovery client, requesting info from "https://10.0.2.15:6443"
I0702 11:09:08.268102   10342 round_trippers.go:386] curl -k -v -XGET  -H "Accept: application/json, */*" -H "User-Agent: kubeadm/v1.11.0 (linux/amd64) kubernetes/91e7b4f" 'https://10.0.2.15:6443/api/v1/namespaces/kube-public/configmaps/cluster-info'
I0702 11:09:08.268676   10342 round_trippers.go:405] GET https://10.0.2.15:6443/api/v1/namespaces/kube-public/configmaps/cluster-info  in 0 milliseconds
I0702 11:09:08.268873   10342 round_trippers.go:411] Response Headers:
[discovery] Failed to request cluster info, will try again: [Get https://10.0.2.15:6443/api/v1/namespaces/kube-public/configmaps/cluster-info: dial tcp 10.0.2.15:6443: connect: connection refused]
</code></pre>

<p>The port seems closed (from the node):</p>

<pre><code>telnet 10.0.2.15 6443
Trying 10.0.2.15...
telnet: Unable to connect to remote host: Connection refused
</code></pre>

<p>While on the master:</p>

<pre><code>telnet 10.0.2.15 6443
Trying 10.0.2.15...
Connected to 10.0.2.15.
Escape character is '^]'.
^CConnection closed by foreign host.
</code></pre>

<p>What may be the cause of this?</p>

<p>Both machines are virtual machines and 10.02.15 is the NAT ip - which is the same for both machines (they are independent)...</p>

<p>Sigh...</p>

<p>In the event it is helpful to someone else:</p>

<pre><code>iptables -t raw -A OUTPUT -p tcp --dport 6443 -j TRACE
iptables -t raw -A PREROUTING -p tcp --dport 6443 -j TRACE
tail -f /var/log/kern.log
</code></pre>
