Hey @nisrine elloumi
Are you still facing the error of org.apache.kafka.common.KafkaException: Exception while loading Zookeeper JAAS login context 'Client'? Is security.inter.broker.protocol also set up? If it's set to PLAINTEXTSASL, can you try modifying it to SASL_PLAINTEXT
I think PLAINTEXTSASL might be the root of your issues here, as this is what it used to be called before you upgraded your ambari (I recall from another thread that this is when your issues started).
Let's try to update to SASL_PLAINTEXT, on security.inter.broker.protocol & atlas.kafka.security.protocol...
Edit; PS security.inter.broker.protocol is set in 'custom kafka-broker'
