​Hiii i m facing the same issue will you plz help me to get into this out unreachable.png ( this action will check accessibility of KDC host and port from Ambari Server host) on os level kerberos is working fine....

[#1]

10 May 2017 14:20:55,896 WARN [ambari-client-thread-4615] KdcServerConnectionVerification:242 - An unexpected exception occurred while attempting to communicate with the KDC server at maxiqtesting1.lti.com:88 over UDP 10 May 2017 14:20:55,896 ERROR [ambari-client-thread-4615] KdcServerConnectionVerification:115 - Failed to connect to the KDC at maxiqtesting1.lti.com:88 using either TCP or UDP

[#2]

@PATHAN SHEBAZ RUSTUM

Try switching to TCP rather than UDP by editing the "/etc/krb5.conf" file and makind the following changes:

In /etc/krb5.conf:

[libdefaults]
  udp_preference_limit = 1

As i see error related to UDP (maxiqtesting1.lti.com:88 over UDP). So worth testing it.

.

Then restart the affected service.

[#3]

Brother i have made changes but again its unreacheable [ambari-client-thread-637] KdcServerConnectionVerification:242 - An unexpected exception occurred while attempting to communicate with the KDC server at maxiqtesting1.lti.com:88 over UDP 10 May 2017 17:54:42,799 ERROR [ambari-client-thread-637] KdcServerConnectionVerification:115 - Failed to connect to the KDC at maxiqtesting1.lti.com:88 using either TCP or UDP