SSO Setup Issue - Error

I am trying to set up SSO on a V7R3 IBMi

The box does not have support - it is only used for testing and is being
decommissioned

This is just a proof of concept / test for SSO

I have followed the document
https://www.ibm.com/support/pages/how-configure-eim-and-nas-using-ibm-navigator-i


All the verification has succeeded but when I try to log on using kerberos
authentication I get the error;

MSGKRB001 - Kerberos error for system <ip-address>
(Failure unspecified at GSS-API level (Mechanism
level:80090303=InitiateSecurityContext() len=16384 ctx=00000000
SEC_E_TARGET_UNKNOWN))

Can anyone point me in the right direction to understand / resolve this
issue.

Thank you in advance.

Don


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