All, Thanks for your response. I found the root cause of this issue in my case, Ambari was using Ambari master key for KDC admin credentials which was present at /var/lib/ambari-server/keys/credentials.jceks. I have taken backup of it and was able to work on 'Enable kerberos through Ambari UI'. But that previous file is required at the time of ambari-server restart. So need to keep ambari-master key same as KDC admin key (password). PFA, kerberos-admin-creds-issue-solved.png ... View more

@Geoffrey Shelton Okot PFA for services restart, services-restart.png ... View more

Ok. You can check files which I have already attached in above comments. Absolute path of files are /etc/hosts, /etc/krb5.conf, /etc/krbkdc/kadm5.acl, /etc/krb5kdc/kdc.conf PFA, krb5conf.png kdcconf.png kadm5conf.png hosts.png ... View more

@Geoffrey Shelton Okot Apart from the above can you share a tokenized version of your the below files- Sorry I did not get what you have asked. klist -V Kerberos 5 version 1.13.2 And KDC server's hostname -f output is --> ubuntu19.example.com Check attached files of KDC server, krb5conf.pngkdcconf.pngkadm5conf.pnghosts.png ... View more

@Robert Levas It is showing output as expected PFA, keytool-output.png ... View more

@Robert Levas I have checked ambari-server.log file at that time and made password store persistent by executing below command and from Ambari UI, I was able to check on save password box, curl -H "X-Requested-By:ambari" -u admin:admin -X PUT -d '{ "Credential" : { "principal" : "kadmin/admin@EXAMPLE.COM", "key" : "123456", "type" : "persisted" } }' http://ambari-server-host-ip:8080/api/v1/clusters/Ambari_PreDev/credentials/kdc.admin.credential But still Ambari UI is giving exception as missing credentials and not able to kerberize cluster. Also my last admin principal created is admin/admin@EXAMPLE.COM and changed password is password. PFA, ambari-server-logs.png ... View more

@Sampath Kumar I have already tried above steps and again tried the same as you said from reinstalltion of kerberos but facing the same issue. ... View more