OK.  The way in which the principal is determined changed between krb5
1.8 and 1.6.  In 1.8 the system searches through all the keys in the
keytab looking for a key that successfully decrypts a ticket.  The
server name sent in the ticket over the network is ignored (at least by
sshd) and only the key in the keytab's name is used.

So, if you had a key in your keytab with principal name host/a.com and
the same key as host/b.com, then 1.8 and 1.6 might have different ideas
about what the request was actually from.

--Sam



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