HTTPS - mutual authentication

Hi all,

can anybody help me with this issue?
We are using wM6.5 without TN.

I am trying to set up HTTPS connection with mutual authentication with WebSphere server and send XML messages using SOAP.

I was told that I need to send XML with certificate and then it should work.

I am using soapHTTP service to send message to websphere but I am getting “Null pointer exception”.

I installed CA certificate and added it in Outbound SSL Certificate section.
When I installed this certificate to browser I was able to connect to their webservice.
With HTTP connection works without any problem.

I would like to ask what do I need to establish connection successfully.
Do I need private/public key or something else?

Thanks for any help.