Kerberos on Ambari 2.6.2.2: 500 status code received on POST method for API: /api/v1/clusters/hdp265/requests

[#1]

I am trying to enable Kerberos on Ambari 2.6.2.2 on CentOS 7.  Below are the errors
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500 status code received on POST method for API: /api/v1/clusters/hdp265/requests
Error message: An internal system exception occurred: Failed to execute the command: Broken pipe

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Below is my krb5.conf file

nano /etc/krb5.conf

# Configuration snippets may be placed in this directory as well
includedir /etc/krb5.conf.d/

[logging]
default = FILE:/var/log/krb5libs.log
kdc = FILE:/var/log/krb5kdc.log
admin_server = FILE:/var/log/kadmind.log

[libdefaults]
dns_lookup_realm = false
ticket_lifetime = 24h
renew_lifetime = 7d
forwardable = true
rdns = false
pkinit_anchors = /etc/pki/tls/certs/ca-bundle.crt
default_realm = HADOOPSECURITY.COM
default_ccache_name = KEYRING:persistent:%{uid}

[realms]
# EXAMPLE.COM = {
# kdc = kerberos.example.com
# admin_server = kerberos.example.com
# }
HADOOPSECURITY.COM = {
kdc = p1.bigdata.com
admin_server = p1.bigdata.com
}

[domain_realm]
.p1.bigdata.com = HADOOPSECURITY.COM
p1.bigdata.com = HADOOPSECURITY.COM

************************************

nano /var/kerberos/krb5kdc/kadm5.acl
*/admin@HADOOPSECURITY.COM *

[#2]

@vsrikanth9 

Your krb5.conf entry is wrong  please change it to match the below

[domain_realm]
.hadoopsecurity.com = HADOOPSECURITY.COM
hadoopsecurity.com = HADOOPSECURITY.COM

The restart the kdc and kadmin

# systemctl start krb5kdc.service
# systemctl start kadmin.service

That should resolve your problem

Happy hadooping 

[#3]

Here I am attaching the Config screenshot.  See if I am making any mistakes.

There is no change in error even after your instructions.  Same error.