>>>>> "Weijun" == Weijun Wang <Weijun.Wang at sun.com> writes: Weijun> How do I interpret "the only case" below? It sounds like KDC Weijun> should only return a referral if the request is for a TGT. That's correct: RFC 4120 only permits referrals for TGTs. Modern Kerberos uses the canonicalize flag to permit referrals in other situations.