Review the instructions to configure SAP jConnect to use Kerberos security mechanism.
There are several prerequisites for configuring Kerberos for SAP jConnect:
JDK 6 or later
A Java Generic Security Services (GSS) Manager:
The default GSS Manager, which is part of the JDK, or
Wedgetail JCSI Kerberos version 2.6 or later, or
CyberSafe TrustBroker Application Security Runtime Library version 3.1.0 or later, or
A GSS Manager implementation from another vendor.
A key distribution center(KDC) that is supported and interoperable at the server side with your GSS library and at the client side with your GSSManager.