GitHub user Pearl1594 added a comment to the discussion: Kubernetes Cluster
Scale Fails – Worker Nodes Not Joining After Scale Operation (CloudStack
4.19.0.1)
@vishnuvs369 For the give CKS cluster, does the cluster network's source NAT IP
have any firewall rules in place? Based on the logs you've shared, it shows
that there's an NPE when attempting to delete the firewall rules in place:
```
2026-02-02 06:23:16,026 INFO [c.c.k.c.a.KubernetesClusterActionWorker]
(API-Job-Executor-1:ctx-9ed67e35 job-2217 ctx-31d5271e) (logid:5f736f29)
Provisioned node VM : prod-node-19c1d04d78b in to the Kubernetes cluster : prod
2026-02-02 06:23:16,045 ERROR [c.c.a.ApiAsyncJobDispatcher]
(API-Job-Executor-1:ctx-9ed67e35 job-2217) (logid:5f736f29) Unexpected
exception while executing
org.apache.cloudstack.api.command.user.kubernetes.cluster.ScaleKubernetesClusterCmd
java.lang.NullPointerException
at
com.cloud.kubernetes.cluster.actionworkers.KubernetesClusterResourceModifierActionWorker.removeSshFirewallRule(KubernetesClusterResourceModifierActionWorker.java:520)
```
GitHub link:
https://github.com/apache/cloudstack/discussions/12577#discussioncomment-15692812
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