Cannot contact the key distribution center

When we use the am_kinit command, you receive the following error:
Unable to obtain initial credentials. Status 0x96c73a9c
Cannot contact any KDC in requested realm.

The host name for the key distribution center (KDC) that is defined in the /opt/PolicyDirector/etc/krb5.conf file is valid, but the KDC cannot be contacted. Verify the following conditions:

Parent topic: Unable to obtain initial credentials