Using Ariba Web-Services with Web-Service Security

Hi Ariba Experts,

We are implementing Ariba-SAP integration using Ariba provided inbound(to Ariba) web-service. We have configured the Web-Service Security(Sign / Encrypt) with Ariba Web-services. To do this:

• We are using SAP PO as Middleware
• We have created an inbound end-point in Ariba using

           Manage --> Administration -->  Integration Manager --> End Point Configuration

• We have maintained Middleware's (EAI's) certificate in Inbound End Point
• Configured the EAI for web-service security as following :

     For Request Message:

     1. Signing the message with EAI Private Key

     2. Encrypting the message with Ariba Public Key

     For Response Message:

     1. Validating the message with Ariba's Public Key

     2. Decryption the message with EAI's Private Key

All Configuration seems fine. However, everytime we call the web-service, we get following error:

" java.io.IOException: invalid content type for SOAP: TEXT/HTML; HTTP 500 Internal Server Error"

Please suggest if anyone else has faced such issues with Ariba web-services or have any idea about the issue.

Regards,

Sami.