<p>I have set up a k8s cluster (1 node cluster) using DOKS. The service is running fine with nodeport config. However, I am unable to access it using <code>http://${NodeIP}:${NodePort}</code> from browsers. I have even tried to add the firewall rule, but i am getting <code>error response from backend</code> while trying to add a new inbound TCP rule. Not a useful error message!</p>
<p>Curl and Telnet are failing as well.</p>
<p>Please find below my dockerfile, deployment and service yaml files.</p>
<p><strong>Dockerfile</strong></p>
<pre><code>FROM nginx:1.21.1
COPY build/ /usr/share/nginx/html
RUN rm /etc/nginx/conf.d/default.conf
COPY nginx/nginx.conf /etc/nginx/conf.d
EXPOSE 80
CMD [&quot;nginx&quot;, &quot;-g&quot;, &quot;daemon off;&quot;]
</code></pre>
<p><strong>Service YAML file</strong></p>
<pre><code>kind: Service
apiVersion: v1
metadata:
  name: int
spec:
  type: NodePort
  ports:
    - port: 80
      targetPort: 80
      protocol: TCP
      nodePort: 31000
  selector:
    app: int
</code></pre>
<p><strong>Deployment YAML</strong></p>
<pre><code>kind: Deployment
apiVersion: apps/v1
metadata:
  name: int
spec:
  replicas: 2
  selector:
    matchLabels:
      app: int
  template:
    metadata:
      labels:
        app: int
    spec:
      containers:
        - name: int
          image: registry.digitalocean.com/xxxxx/int:latest
          imagePullPolicy: Always
          ports:
            - containerPort: 80
      restartPolicy: Always
</code></pre>
<p><strong>Kubectl get pods output</strong></p>
<pre><code>root@ast-a1:~# kubectl get pods
NAME                         READY   STATUS    RESTARTS   AGE
int-7cc5445c7-hnwvp      1/1     Running   0          3h14m
int-7cc5445c7-qtr6n      1/1     Running   0          3h14m
</code></pre>
<p><strong>Kubectl get svc output</strong></p>
<pre><code>root@ast-a1:~# kubectl get svc
NAME         TYPE        CLUSTER-IP      EXTERNAL-IP   PORT(S)        AGE
int          NodePort    10.xxx.xx.xx    &lt;none&gt;        80:31000/TCP   152m
kubernetes   ClusterIP   10.xxx.x.x      &lt;none&gt;        443/TCP        3d3h
</code></pre>
<p><strong>The response</strong></p>
<p><a href="https://i.stack.imgur.com/ACyqQ.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/ACyqQ.png" alt="enter image description here" /></a></p>
<p>Am I making a mistake somewhere? I am just trying out DOKS.</p>
<p>EDIT:</p>
<p>Added tracert output.</p>
<pre><code>C:\Users\ck5&gt;tracert 1xx.xx.xx.xxx

Tracing route to 1xx.xx.xx.xxx over a maximum of 30 hops

  1     *        *        *     Request timed out.
  2     *        *        *     Request timed out.
  3     4 ms     2 ms     3 ms  1x.1xx.xx.xx.static-hydrabad.vsnl.net.in [1x.1xx.xx.xx]
  4     *        *        *     Request timed out.
  5    49 ms    52 ms    12 ms  2xx.6x.xxx.xxx.static-bangalore.vsnl.net.in [2xx.xx.xxx.xxx]
  6    13 ms    12 ms   110 ms  1xx.1xx.2xx.15
  7     *        *        *     Request timed out.
  8     *        *        *     Request timed out.
  9     *        *        *     Request timed out.
 10     *        *        *     Request timed out.
 11     *        *        *     Request timed out.
 12     *        *        *     Request timed out.
 13     *        *        *     Request timed out.
 14     *        *        *     Request timed out.
 15     *        *        *     Request timed out.
 16     *        *        *     Request timed out.
 17     *        *        *     Request timed out.
 18     *        *        *     Request timed out.
 19     *        *        *     Request timed out.
 20     *        *        *     Request timed out.
 21     *        *        *     Request timed out.
 22     *        *        *     Request timed out.
 23     *        *        *     Request timed out.
 24     *        *        *     Request timed out.
 25     *        *        *     Request timed out.
 26     *        *        *     Request timed out.
 27     *        *        *     Request timed out.
 28     *        *        *     Request timed out.
 29     *        *        *     Request timed out.
 30     *        *        *     Request timed out.

Trace complete.
</code></pre>

<p>Looks like a security group or a firewall issue. Run a traceroute to the destination IP from the machine with your browser.</p>
<p>If it stops at the last hop, it is most likely the security group not allowing connections to your port from the source subnet.</p>
<p>If the traceroute stops in the middle it is more likely a firewall issue.</p>
