Connectivity Issue: Unable to Telnet to Kubernetes Services from Nodes Other Than the Deployment Node

The presented issue revolves around a Kubernetes cluster that has been successfully installed using kurl on Ubuntu 22. All Kubernetes pods appear to be functioning as expected without any apparent disruptions. However, a critical connectivity problem happend, preventing from establishing Telnet connections to the services (like private registry which we deployed with the cluster ) hosted within the cluster from nodes other than the node where the services’ pods are deployed.

Upon initial observation, the Kubernetes cluster appears to be functioning correctly, with pods running, services deployed, and overall cluster health indicating normal operations. Despite this seemingly healthy state, attempts to Telnet to the services from nodes other than the specific node hosting the corresponding pods result in failure.