Wrong ticket encryption for W2K clients only

[Ron Perzul]

Hi, 

I am facing the following problem. 

The Windows service account used for Vintela SSO is set up using "Use DES encryption for this account". The keytab is created with ktpass ... -crypto DES-CBC-MD5 encryption. 

Everything is working when I login to the web application from a Windows 2003 server machine. On the Windows 2003 server machine part of the klist tickets command is as follows (Kerberos ticket encryption of type DES-CBC-MD5 as expected): 

   Server: HTTP/server.eu.xxx.com at EU.XXX.COM 
      KerbTicket Encryption Type: Kerberos DES-CBC-MD5  
      End Time: 8/3/2007 21:38:37 
      Renew Time: 8/10/2007 11:38:37 

But on the Windows 2000 clients the ticket is encrypted with RC4-HMAC-NT: 

   Server: HTTP/server at EU.XXX.COM 
      KerbTicket Encryption Type: Kerberos RSADSI RC4-HMAC(NT) 
      End Time: 8/3/2007 21:42:55 
      Renew Time: 8/10/2007 11:42:55 

The wrong obtained ticket causes SSO to fail. 

Tomcat output is: 

HTTP Status 500 - com.wedgetail.idm.sso.ProtocolException: com.wedgetail.idm.spnego.server.SpnegoException: GSSException: Failure unspecified at GSS-API level (Mechanism level: com.dstc.security.kerberos.KerberosException: Successfully matched service principal " HTTP/SERVER.EU.XXX.COM at EU.XXX.COM but not key type (23) + KVNO (2) in this entry: Principal: HTTP/SERVER.EU.XXX.COM at EU.XXX.COM Type: 1 TimeStamp: Wed Dec 31 19:00:00 EST 1969 KVNO: -1 Key: [3, 67 ec a8 a8 75 e0 ab 3e ] ) 

So the encryption type of the client ticket (which is of type 23=RC4-HMAC-NT) does not match the entry in the keytab (type 3=DES-CBC-MD5). 

Why does the Windows 2000 machine get a different encrypted ticket? Also, there is a difference in the SPN returned in the output of the klist tickets above. 

Any help would be greatly appreciated. 

Thanks, 

Ron