Fix SaslAuthenticationException

✅ Solution

The "SaslAuthenticationException" in Logstash typically arises from incorrect or missing SASL configuration for Kafka authentication, such as wrong username/password or missing Kerberos setup. To fix it, carefully verify the `sasl_username`, `sasl_password`, `security_protocol`, `sasl_mechanism`, and Kerberos-related settings (if applicable) in your Logstash Kafka input or output plugin configuration, ensuring they match the Kafka server's requirements. Double-checking the Kerberos configuration on the Logstash host, including `krb5.conf`, is also essential for Kerberos-based authentication.