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Attempting to Create an SPN Using "setspn" Utility for Kerberos Authentication With WebCenter Portal on Windows Fails with "Error: Duplicate SPN found, aborting operation!" (Doc ID 2313042.1)

Last updated on FEBRUARY 27, 2019

Applies to:

Oracle WebCenter Portal - Version 11.1.1.9.0 to 12.2.1.3.0
Information in this document applies to any platform.

Symptoms

Attempting to create a Service Principal Name (SPN) for Kerberos Authentication for WebCenter Portal on Windows fails with error:


ERROR

Duplicate SPN found, aborting operation!

 

STEPS

Issue can be reproduced with the following steps when the Middleware / WebCenter Portal is installed on a Windows Environment: 

  1. Create an account matching the hostname where the WebCenter Portal domain is installed as per the following documentation:

    Fusion Middleware Administering Security for Oracle WebLogic Server
    20 Configuring Single Sign-On with Microsoft Clients
    Creating a Kerberos Identification for WebLogic Server
    Step 1: Create a User Account for the Host Computer


  2. Create the SPN for the HTTP service for the WebLogic Server account as per the following documentation:

    Fusion Middleware Administering Security for Oracle WebLogic Server
    20 Configuring Single Sign-On with Microsoft Clients
    Creating a Kerberos Identification for WebLogic Server
    Step 3: Define a Service Principal Name and Create a Keytab for the Service


    Here you will see the error.
    e.g.:

    <DRIVE:\PATH> setspn -A HTTP/<FQ_SERVERNAME> <SERVERNAME>
    Checking domain DC=<COMPANY>
    HTTP/<FQ_SERVERNAME>

    Duplicate SPN found, aborting operation!

     

 

Changes

 

Cause

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In this Document
Symptoms
Changes
Cause
Solution
References


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