chris wrote:
...


When testing see Log dump --->

  Nov 14, 2013 10:04:50 PM org.apache.catalina.authenticator.SpnegoAuthenticator
authenticate

  SEVERE: Unable to login as the service principal

  javax.security.auth.login.LoginException: Unable to obtain password from user

            at
com.sun.security.auth.module.Krb5LoginModule.promptForPass(Unknown Source)
            at
..
I am not a Kerberos specialist, but why would the above 2 lines be there ?
The whole point of SSO normally, is to not have to promt the user for a login/password, and get the authentication directly from the logged-in workstation. In a Windows-domain-style SSO, the fact of prompting the user usually already indicates that something (some prior step) is not working as it should.

I would suggest to use a protocol analyser (maybe just a browser plugin) to check what really goes on there.

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