Unable to Test the UMWebService

Hi,

When I test the UME WebService in the Web Service Navigator (http://server:<portno>/wsnavigator/enterwsdl.html) by giving its URL http://server:<portno>/irj/servlet/prt/soap/UMWebService.

I get the following error

An error has occurred. Maybe the request is not accepted by the server:

The User Authentification is not correct to access to the Portal Service UMWebService or the service was not found

Is there some thing to be configured? Please guide.

Thanks & Regards

Veerabhadram