Hi,

just a hint; We've had similar 'permission denied errors', not quite the same as yours though. But they were solved by changing the perms of the file /etc/krb5.conf from 640 to 644.
For reasons I still don't understand, the 'permission denied' error showed up only after a machine reboot. And a 'service sssd restart' solved it temporarily as well, strangely enough.

We found the solution by setting the debug level to 10 in sssd.conf, and then an error showed up that led me to a site where this was posted by somebody.

Cheers,

El 20/08/14 09:23, Chris Malton escribió:
sssd[krb5_child[3650]]]] [create_ccache] (0x0020): 574: [13][Permission denied]

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Gerardo