We can resolve the TLS handshake error on Kubernetes by following the instructions in this article. As part of our Kubernetes Support, Bobcares provides answers to all of your questions.

TLS Handshake Error on Kubernetes: Solution

There can be a number of reasons why we’re seeing TLS handshake failures in a Kubernetes environment even when the certificates are valid. We can take the following actions in order to identify and resolve the issue:

1. Initially, check that the set-up of certificates we are using is correct and has not expired. So, to ensure the authenticity of the certificates, check both the client and server ones.

2. Verify that the proper certificate chain has been configured. The server certificate and any intermediate or root certificates required for the validation procedure should be included in the certificate chain.

3. Usually, TLS certificates exist for certain hostnames. Make sure that the hostname in the Kubernetes setup corresponds to the hostname in the certificate.

4. Make sure that every node in the Kubernetes cluster has a synchronised system clock. Time differences can also cause failures in the TLS handshake.

5. Also, examine whether any firewall rules or network problems could be the source of the components’ inability to communicate with one another.

6. Make sure that the load balancer’s TLS termination settings are proper if we’re using one in front of the Kubernetes services.

7. Then, make sure that the setup of Ingress resource and other TLS settings is correct if we’re using an Ingress controller to route traffic to the services.

8. Verify that the client establishing the connection trusts the CA certificate that was used to sign the server certificate. Make sure that the CA certificate is set up appropriately on the client and server.

9. For more thorough error messages, also look through the logs of the impacted pods or services. Since these logs may offer more details regarding the particular TLS handshake fault.

10. Check for compatibility between the TLS versions and cypher suites set up on the client and server sides. Failures in handshakes may result from mismatched settings.

11. The handshake procedure may take longer if the pods have insufficient CPU as well as memory. So, make sure the pods have sufficient capacity in order to manage the TLS connections.

12. Make sure the TLS setup we have put up is compatible with the version of Kubernetes we are using.

13. Lastly, any third-party tools or security solutions we may be using can hamper the handshake process. So, to find the cause,  temporarily disable them for testing.

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Conclusion

Troubleshooting TLS handshake errors on Kubernetes can be intricate and may necessitate examining many setups, logs, and network configurations.