Java Security

I am trying to follow the tutorial for JAAS Authentication located here:
http://java.sun.com/j2se/1.4.2/docs/guide/security/jgss/tutorials/AcnOnly.html

I am trying to run the sample client JaasAcn.java but am getting a strange error when I try to log on to my Active Directory.

I am using Java version: jre1.6.0_03

I can login to Active Directory fine with the credentials I am providing, just not with this client, so I know the credentials are valid.

Here is the error I get that I don't understand. Any suggestions would be very helpful, if you provide help for this

The Error message is: [Krb5LoginModule] authentication failed
Message stream modified (41)

Here is the full output:

C:\Progra~1\Java\jre1.6.0_03\bin\java -Dsun.security.krb5.debug=true -Djava.security.krb5.realm=PRSDev.local -Djava.security.krb5.kdc=192.168.40.72 -Djava.security.auth.login.config=jaas.conf JaasAcn

Debug is true storeKey false useTicketCache false useKeyTab false doNotPrompt f
alse ticketCache is null isInitiator true KeyTab is null refreshKrb5Config is fa
lse principal is null tryFirstPass is false useFirstPass is false storePass is f
alse clearPass is false
Kerberos username [ILea]: sra
Kerberos password for sra:
[Krb5LoginModule] user entered username: sra

Using builtin default etypes for default_tkt_enctypes
default etypes for default_tkt_enctypes: 3 1 23 16 17.
Acquire TGT using AS Exchange
Using builtin default etypes for default_tkt_enctypes
default etypes for default_tkt_enctypes: 3 1 23 16 17. 3, #bytes=144 =144 sTime is Mon Dec 31 11:56:40 PST 2007 1199131000000
suSec is 884978
error code is 25
error Message is Additional pre-authentication required
realm is PRSDev.local
sname is krbtgt/PRSDev.local
eData provided.
msgType is 30 PA-DATA type = 11
PA-ETYPE-INFO etype = 23 PA-DATA type = 2
PA-ENC-TIMESTAMP PA-DATA type = 15
AcquireTGT: PREAUTH FAILED/REQUIRED, re-send AS-REQ
Using builtin default etypes for default_tkt_enctypes
default etypes for default_tkt_enctypes: 3 1 23 16 17.
Pre-Authentication: Set preferred etype = 23 Pre-Authenticaton: find key for etype = 23
AS-REQ: Add PA_ENC_TIMESTAMP now 3, #bytes=210 =210 [Krb5LoginModule] authentication failed
Message stream modified (41)
Authentication failed:
Message stream modified (41)