Delay to display the response screen of Negotiation Toolkit

Issue

• Over ten minutes has passed to display the response basic screen of Negotiation Toolkit
• It seems to take some time to refresh a ticket with such logged message Refreshing Kerberos configuration.
• Thread is waiting for the response from KDC and the following stack.

"default task-6" #214 prio=5 os_prio=0 tid=0x0000000019606000 nid=0x197c runnable [0x000000001af39000]
   java.lang.Thread.State: RUNNABLE
    at java.net.TwoStacksPlainDatagramSocketImpl.receive0(Native Method)
    - locked <0x00000000f4ecedc0> (a java.net.TwoStacksPlainDatagramSocketImpl)
    at java.net.TwoStacksPlainDatagramSocketImpl.receive(TwoStacksPlainDatagramSocketImpl.java:114)
    - locked <0x00000000f4ecedc0> (a java.net.TwoStacksPlainDatagramSocketImpl)
    at java.net.DatagramSocket.receive(DatagramSocket.java:812)
    - locked <0x00000000f4ecef48> (a java.net.DatagramPacket)
    - locked <0x00000000f4eced58> (a java.net.DatagramSocket)
    at sun.security.krb5.internal.UDPClient.receive(NetClient.java:206)
    at sun.security.krb5.KdcComm$KdcCommunication.run(KdcComm.java:411)
    at sun.security.krb5.KdcComm$KdcCommunication.run(KdcComm.java:364)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.security.krb5.KdcComm.send(KdcComm.java:348)
    at sun.security.krb5.KdcComm.sendIfPossible(KdcComm.java:253)
    at sun.security.krb5.KdcComm.send(KdcComm.java:229)