Inconsistent Network Policies Blocking Internal Traffic

Internal pod-to-pod traffic was unexpectedly blocked due to inconsistent network policies.

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What Happened

After applying a set of network policies, pods in the same namespace could no longer communicate, even though they should have been allowed by the policy.

Diagnosis Steps

1Reviewed the network policies and found conflicting ingress rules between services.
2Analyzed logs of the blocked pods and confirmed that network traffic was being denied due to incorrect policy definitions.

Root Cause

Conflicting network policy rules that denied internal traffic.

Fix/Workaround

• Merged conflicting network policy rules to allow the necessary traffic.
• Applied the corrected policy and verified that pod communication was restored.

Lessons Learned

Network policies need careful management to avoid conflicting rules that can block internal communication.

How to Avoid

1Implement a policy review process before applying network policies to production environments.
2Use tools like Calico to visualize and validate network policies before deployment.

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