Sadique Puthen notes that the warning on the client side seems to be correspond
to the wrong attribute on the KDC.  Do what RFC4120 says we should do.  RT#5755.
--- krb5-1.6.2/src/kdc/do_as_req.c	2007-06-25 15:49:06.000000000 -0400
+++ krb5-1.6.2/src/kdc/do_as_req.c	2007-06-25 15:49:08.000000000 -0400
@@ -371,7 +371,14 @@ process_as_req(krb5_kdc_req *request, kr
 	goto errout;
     }
     reply_encpart.nonce = request->nonce;
-    reply_encpart.key_exp = client.expiration;
+    if (client.expiration == 0) {
+       reply_encpart.key_exp = client.pw_expiration;
+    } else if (client.pw_expiration == 0) {
+       reply_encpart.key_exp = client.expiration;
+    } else {
+       reply_encpart.key_exp = client.pw_expiration < client.expiration ?
+                               client.pw_expiration : client.expiration;
+    }
     reply_encpart.flags = enc_tkt_reply.flags;
     reply_encpart.server = ticket_reply.server;