Sender SOAP Adapter Authentication issue

All,

We have a SOAP-XI-RFC scenario. We exported the wsdl from the Integration Directory. When we try to call the web service using webservice studio client. We get the following error. We are using a user that has (SAP_XI_ADMINISTRATOR role on it).

ResponseCode: 401 (Unauthorized)

Connection:close

Pragma:no-cache

Content-Length:1790

Cache-Control:no-cache

Content-Type:text/html

Date:Fri, 30 Nov 2007 20:01:23 GMT

Expires:0

Server:SAP J2EE Engine/7.00

WWW-Authenticate:Basic realm="XISOAPApps"

Any thoughts?

Thanks.