KERBEROS : [ Invalid KDC administrator credentials. Please enter admin principal and password. ]

[#1]

Hello everyone,

Ambari : 2.7.4

HDP : 3.1.4.0

While kerberizing my cluster using MIT-KDC and Ambari Kerberos Wizard. I am facing the following window popup at the time of Testing client after client installation saying :

[ Invalid KDC administrator credentials. Please enter admin principal and password. ]

Error logs in /var/log/ambari-server/ : 

We are using the right password and amin principal created while setting up MIT-KDC. Still, the window pops up with the same message again and again.

Please help in resolving the issue.

@jsensharma @Shelton @KuldeepK @nsabharwal Thanks in advance!

[#2]

what are you setting in /etc/hostname ? 
the same issue in my setup Kerberos