Delegating a credential to a server causes the server side acceptSecContext to throw an exception:

Krb5Module username(mdu): sample/vishwas.eng.sun.com
Krb5Module password for user (sample/vishwas.eng.sun.com): bogus
Waiting for incoming connection...
Got connection from client /129.144.124.222
Will read input token of size 2378 for processing by acceptSecContext
java.security.PrivilegedActionException
...
...
Caused by: java.lang.IllegalArgumentException: Authentication time of ticket
cannot be null
        at
javax.security.auth.kerberos.KerberosTicket.init(KerberosTicket.java:185)
        at
javax.security.auth.kerberos.KerberosTicket.<init>(KerberosTicket.java:128)
        at
sun.security.jgss.krb5.Krb5InitCredential.<init>(Krb5InitCredential.java:107)
        at
sun.security.jgss.krb5.Krb5InitCredential.getInstance(Krb5InitCredential.java:187
)
        at
sun.security.jgss.krb5.InitSecContextToken.<init>(InitSecContextToken.java:110)
        at
sun.security.jgss.krb5.Krb5Context.acceptSecContext(Krb5Context.java:579)
        at
sun.security.jgss.GSSContextImpl.acceptSecContext(GSSContextImpl.java:303)
        at
sun.security.jgss.GSSContextImpl.acceptSecContext(GSSContextImpl.java:249)
        at SampleServer.main(SampleServer.java:85)
        ... 5 more