I have a requirement to call an external web service that is hosted on Windows platform from Siebel on UNIX. The web service is secured using WS-Security but requires Windows authentication based on Kerberos. The web service is SSL enabled web service but requires a kerberos ticket. When I try to consume the service using EAI I get a 401 error from it. Which as I understand is the passive way of implementing kerberos integration. So my question is what are my options? How can I implement such a scenario?