X-RT-Original-Encoding: utf-8 X-Mailer: MIME-tools 5.507 (Entity 5.507) Content-Disposition: inline References: MIME-Version: 1.0 Message-ID: Content-Transfer-Encoding: binary X-RT-Interface: Web In-Reply-To: Content-Type: text/html; charset="utf-8" RT-Send-CC: Content-Length: 247 In the previous comment, I meant to say S4U2Proxy, not S4U2Self.  This wrinkle cannot be ironed out, because krb5_get_credentials() can only see the evidence ticket, not the  client name within, so it cannot check the cache.