Accessing webservice with active directory authentication

Dear Experts,

We are trying to access a webservice which required an active directory authentication. We couldn’t find any option in ib-soap protocol properties for providing user id and password. Below is the error message shown when we try to load the WSDL,

PKIX path building failed

Unable to find valid certification path to requested target

We are using Cloverleaf 5.8 version which is hosted in Linux environment.

Please let me know on how to access a webservice which is protected with active directory authentication. Appreciate your help.

Thank you.