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I am trying to implement Single Sign On using kerberos with ssh. I changed the below files and restarted the ssh daemon.

/etc/ssh_config

GSSAPIAuthentication yes
GSSAPIDelegateCredentials yes

/etc/sshd_config

GSSAPIAuthentication yes

When I am trying to ssh from an ubuntu machine to centos. I got the below exception

Unspecified GSS failure.  Minor code may provide more information
Cannot contact any KDC for requested realm

But I am able to login without using password from centos machine to ubuntu. Kinit is working fine in both machines.

What is the problem here?

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Please add the log of the KDC during a login attempt and the relevant portion of /var/log/secure' with LogLevel DEBUG` on the server side. –  dawud May 27 '13 at 20:34

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