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Kerberos - kadmin connection issue

I was getting a communication error when trying to connect from a Kerberos client to the KDC, while yet I was able to successfully be granted a ticket using kinit .

[[email protected] etc]# kadmin -p kerberosadmin/[email protected]
Authenticating as principal kerberosadmin/[email protected] with password.
Password for kerberosadmin/[email protected]:
kadmin: Communication failure with server while initializing kadmin interface

Fix:
It turns out that iptables was blocking access to kadmind on the Master KDC, of which I simply had to allow the TCP port 749 to fix the issue.

-A INPUT -p tcp -m tcp --dport 749 -j ACCEPT

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