Hi, not sure what it means "Tries to communicate with itself". Are you talking about local network loopback?
Also, have you tried ssl debug using openssl? What did you observe? The exception is handshake exception. This is quite common when your cert validation fails. How have you setup your signed certificates? Does your CN/SAN matches with your advertised.listeners setup? Have you setup hostname verification correctly? Thanks, On Mon, 28 Oct 2019 at 11:11, Péter Nagykátai <st4r.f1...@gmail.com> wrote: > @Jose > > >It looks like communication problem between brokers. > As I mentioned, "I can't get the first broker started". The message above > is from when the broker tries to communicate with "itself": [Controller > id=1001, targetBrokerId=1001]). > > Nevertheless, I went through the checklist and everything is in order. For > the first couple of tries, I got different SSL errors but I could work > those out (that time I messed up the certificates), but now the problem is: > >> Caused by: javax.net.ssl.SSLProtocolException: *Unexpected handshake > **message: > server_hello* > > Peter > > On Mon, Oct 28, 2019 at 8:09 AM Jose Manuel Vega Monroy < > jose.mon...@williamhill.com> wrote: > > > @Peter > > > > It looks like communication problem between brokers. But ensure: > > > > 1) Crtificates are valid and properly signed by root CA or intermediate > > one in the chain > > 2) Clients and brokers having private key and certificate in their > > keystore and properly configured to point to its path > > 3) Clients and brokers having CA certificates in the truststore and > > properly configured to point to its path > > 4) Clients and brokersbroker having root CA certificate in their keystore > > and properly configured to.point to its path > > 5) Permissions are right ones fro trustore and keystore > > > > Thanks > > > > Get Outlook for Android <https://aka.ms/ghei36> > > > > ------------------------------ > > *From:* Péter Nagykátai <st4r.f1...@gmail.com> > > *Sent:* Monday, 28 October 2019, 00:13 > > *To:* users@kafka.apache.org > > *Subject:* [EXTERNAL] SSL setup failing > > > > Hi! > > > > I'm experimenting with setting up a log ingesting cluster and Kafka would > > be part of it. Unfortunately, I can't get the first broker started. I > need > > to secure the communication between a dozen nodes and Kaquiafka would > only > > be > > one part of it. I have a secured node where I generate certificates for > > every server in the cluster (with an intermediate CA). AFAIK, I need to > use > > '.jks' files for Kafka, so I've generated a '.p12' file from the openssl > > certificate and key then used `keytool` to generate a keystore: > > `keytool -importkeystore -srckeystore kafka-1.p12 -srcstoretype PKCS12 > > -alias kafka-1 -destkeystore kafka-1.jks` > > I generated a truststore for the root and intermediate chain as well: > > `keytool -importcert -alias ca-root -keystore truststore.jks -file > > ca-chain.cert.pem > > > > Relevant part of the 'server.properties' configuration: > > #### > > listeners=EXTERNAL://kafka-1:9092,INTERNAL://kafka-1:9093 > > advertised.listeners=EXTERNAL://kafka-1:9092,INTERNAL://kafka-1:9093 > > inter.broker.listener.name=INTERNAL > > listener.security.protocol.map=EXTERNAL:SSL,INTERNAL:SSL > > security.protocol=SSL > > ssl.client.auth=required > > ssl.truststore.location=/*******/truststore.jks > > ssl.truststore.password=************* > > ssl.keystore.location=/*******/kafka-1.jks > > ssl.keystore.password=************* > > #### > > > > After starting Kafka (as a service) I get the the following in the > > 'server.log': > > >>... > > >> INFO [KafkaServer id=1001] started (kafka.server.KafkaServer) > > >> INFO [SocketServer brokerId=1001] Failed authentication with > > /XXX.XXX.XXX.XXX (SSL handshake failed) > > (org.apache.kafka.common.network.Selector) > > >> INFO [Controller id=1001, targetBrokerId=1001] Failed authentication > > with kafka-1/XXX.XXX.XXX.XXX (SSL handshake failed) > > (org.apache.kafka.common.network.Selector) > > >> ERROR [Controller id=1001, targetBrokerId=1001] Connection to node > 1001 > > (kafka-1/XXX.XXX.XXX.XXX:9093) failed authentication due to: SSL > handshake > > failed (org.apache.kafka.clients.NetworkClient) > > >>... > > >> WARN SSL handshake failed (kafka.utils.CoreUtils$) > > >> org.apache.kafka.common.errors.SslAuthenticationException: SSL > handshake > > failed > > >> Caused by: javax.net.ssl.SSLProtocolException: Unexpected handshake > > message: server_hello > > >>... > > > > I couldn't find any lead with that error message and got stuck. Any ideas > > what that error message means and how to solve it? > > > > Specs: > > - Ubuntu 18.04.3 LTS > > - OpenJDK Runtime Environment (build > 11.0.4+11-post-Ubuntu-1ubuntu218.04.3) > > - Kafka 2.2.1 (from kafka_2.12-2.2.1.tgz) > > - OpenSSL 1.1.1 > > > > Thank you! > > Peter > > > > Confidentiality: The contents of this e-mail and any attachments > > transmitted with it are intended to be confidential to the intended > > recipient; and may be privileged or otherwise protected from disclosure. > If > > you are not an intended recipient of this e-mail, do not duplicate or > > redistribute it by any means. Please delete it and any attachments and > > notify the sender that you have received it in error. This e-mail is sent > > by a William Hill PLC group company. 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