After upgrading logstash to 6.6, I get failed authentication due to: SSL handshake failed

Elastic Stack Logstash
1

we have kafka_2.12-2.3.0, and use logstash.
after upgrading to logstash version 6.6, and plugin 7.3.2 logstash-output-kafka, we got an error of

The setting ssl in plugin kafka is obsolete and is no longer available. Use security_protocol

we changed are settings to SSL. sending with plain text works, but with SSL, I get an error of :
compute.internal/172.30.7.160:9093) failed authentication due to: SSL handshake failed
when sending it to the Kafka machine with logstash.

this is the Kafka SSL server.properties:

#security.inter.broker.protocol=SSL
ssl.keystore.location=/opt/Kafka/kafka_2.12-2.3.0/bin/server.keystore.jks
ssl.keystore.password=*********
ssl.key.password=*********
ssl.truststore.location=/opt/Kafka/kafka_2.12-2.3.0/bin/server.truststore.jks
ssl.truststore.password=*********
ssl.endpoint.identification.algorithm=
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