For broker 1

bin/kafka-configs.sh –bootstrap-server b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9094
–entity-type brokers –entity-name 1 –alter –command-config client.properties
–add-config advertised.listeners=[INTERNAL://b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096,EXTERNAL://MSK-kafka-Loadbalancer-25831a7b958a5031.elb.eu-central-1.amazonaws.com:9094]

For broker 2

bin/kafka-configs.sh –bootstrap-server b-2.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9094
–entity-type brokers –entity-name 2 –alter –command-config client.properties
–add-config advertised.listeners=[INTERNAL://b-2.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096,EXTERNAL://MSK-kafka-Loadbalancer-25831a7b958a5031.elb.eu-central-1.amazonaws.com:9095],

all works fine here

bin/kafka-topics.sh –list –bootstrap-server b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096 –command-config client.
properties
__amazon_msk_canary
__consumer_offsets
test-topic-1

this is were im facing issue

[ec2-user@ip-10-1-1-98 kafka_2.13-3.5.1]$ bin/kafka-configs.sh –bootstrap-server b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096
–entity-type brokers –entity-name 1 –alter –command-config client.properties
–add-config advertised.listeners=[INTERNAL://b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096,EXTERNAL://MSK-kafka-Loadbalancer-25831a7b958a5031.elb.eu-central-1.amazonaws.com:9094]
Error while executing config command with args ‘–bootstrap-server b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096 –entity-type brokers –entity-name 1 –alter –command-config client.properties –add-config advertised.listeners=[INTERNAL://b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096,EXTERNAL://MSK-kafka-Loadbalancer-25831a7b958a5031.elb.eu-central-1.amazonaws.com:9094]’
java.util.concurrent.ExecutionException: org.apache.kafka.common.errors.InvalidRequestException: Error creating broker listeners from ‘INTERNAL://b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096,EXTERNAL://MSK-kafka-Loadbalancer-25831a7b958a5031.elb.eu-central-1.amazonaws.com:9094’: No security protocol defined for listener INTERNAL
at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:395)
at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2028)
at org.apache.kafka.common.internals.KafkaFutureImpl.get(KafkaFutureImpl.java:180)
at kafka.admin.ConfigCommand$.alterConfig(ConfigCommand.scala:380)
at kafka.admin.ConfigCommand$.processCommand(ConfigCommand.scala:328)
at kafka.admin.ConfigCommand$.main(ConfigCommand.scala:97)
at kafka.admin.ConfigCommand.main(ConfigCommand.scala)
Caused by: org.apache.kafka.common.errors.InvalidRequestException: Error creating broker listeners from ‘INTERNAL://b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096,EXTERNAL://MSK-kafka-Loadbalancer-25831a7b958a5031.elb.eu-central-1.amazonaws.com:9094’: No security protocol defined for listener INTERNAL

this is were im facing issue

[ec2-user@ip-10-1-1-98 kafka_2.13-3.5.1]$ bin/kafka-configs.sh --bootstrap-server b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096 
--entity-type brokers --entity-name 1 --alter --command-config client.properties 
--add-config advertised.listeners=[INTERNAL://b-1.kaffka.6r40l0.c4.kafka.eu-central-1.amazonaws.com:9096,EXTERNAL://MSK-kafka-Loadbalancer-25831a7b958a5031.elb.eu-central-1.amazonaws.com:9094],listener.security.protocol.map=INTERNAL:SSL,EXTERNAL:SSL
requirement failed: Invalid entity config: all configs to be added must be in the format "key=val".
[ec2-user@ip-10-1-1-98 kafka_2.13-3.5.1]$ 

im trying to set my NLB DNS for my aws msk kafka brokers