@m4x1m1li4n To validate the zookeeper ports can you run the snippets and share the output, it seems CDH uses the port 4181 for its zookeeper I am from the HDP world! Using port 2181 echo "stat" | nc server.example.org 2181 | grep Mode $ telnet slave3.sysdatadigital.it 2181 Using port 4181 echo "stat" | nc slave3.sysdatadigital.it 4181 | grep Mode $ telnet slave3.sysdatadigital.it 4181 Disable the firewall in the VPC which is a subnet doesn't disable the firewall on the host please validate that all the hosts have the firewall disable Assuming you are on Centos/RHEL 7 and share the output readapt if your OS is different # systemctl status firewalld From your CM can you share the zookeeper screenshot
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