@an_dutra My guess is that it's a misconfiguration on your cluster. I just tested this on my Kafka cluster and once the certificate expires, if I try to connect to the cluster with a Kafka client I get the following exception: Caused by: sun.security.validator.ValidatorException: PKIX path validation failed: ... Caused by: java.security.cert.CertPathValidatorException: validity check failed ... Caused by: java.security.cert.CertificateExpiredException: NotAfter: Tue Feb 08 03:45:00 UTC 2022 The Kafka brokers will continue to run, though. However, if they are stopped and I try to start them again, they will fail to start with the same exception as the one above.
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