Hi ,   As part of security we are initially looking to implement level 1 security.After enabling kerberos we get following exception "java.io.IOException: Could not configure server because SASL configuration did not allow the ZooKeeper server to authenticate itself properly: javax.security.auth.login.LoginException: Connection refused" We have followed all the steps - JCE Policy - Keystore / Truststore - Enable the flag for TLS at agent/server - JAAS COnfiig is in place - keytabs are in place and we are able to kinit from each node - Hosts entries also seem to be fine - Enc types we use are AES256 on server and client Cheers Mahesh ... View more