It seems you are enabling Kerberos using Cloudera Manager Wizard.
Generally we may get into two different issue for KDC while Import KDC Account Manager Credentials. Let me give tips for both of them
Pre-request:
a. Make sure all the configuration files are updated with proper REALM
b. Make sure kerberos DB has been created
c. Make sure principals are created
1. Issue: kinit: Cannot contact any KDC for realm 'REALM NAME' while getting initial credentials
Ans: Start the required services as follows
service kadmin start
service krb5kdc start
2. Issue: kinit: Cannot find KDC for requested realm while getting initial credentials
Ans: Before press the "Import KDC Account Manager Credentials" button. Make sure the configuration files are updated in Cloudera Manager (Note: This is different from the configuration file update that i've mentioned in the prerequest section. This is a direct update in CM)
CM -> Adminstration-> Setting -> REALM = REALM Name
CM -> Adminstration-> Setting -> KDC SERVER HOST = HOST Name
Thanks
Kumar