@Shelton  Thank you for your response but as of now first i am testing between server to server authentication and this is how my JAAS files looks like which i refereed from this wiki    https://cwiki.apache.org/confluence/display/ZOOKEEPER/Server-Server+mutual+authentication     QuorumServer { com.sun.security.auth.module.Krb5LoginModule required useKeyTab=true keyTab="<keytab path>" storeKey=true useTicketCache=false debug=false principal="<principal>/_HOST@[REALM]"; }; QuorumLearner { com.sun.security.auth.module.Krb5LoginModule required useKeyTab=true keyTab="<keytab path>" storeKey=true useTicketCache=false debug=false principal="<principal>/_HOST@[REALM]"; };       ... View more