HTTP 401 Error Occurs when Creating the Consumer Proxy

Hi experts,

I want to use some methods suplied by Microsoft Sharepoint's Web Service (Lists.asmx) in my ABAP program. So I followed steps illustrated by Amarnath Singanamala's post Consuming Microsoft SharePoint Web Services in SAP using Basic Authentication. But when I nearly reached the last step of  Creating a Consumer Proxy, I got an problem:

So I entered my Sharepoint Logon user name and password, but failed in the end. Could anyone tell me what the wrong is? Thanks a lot!

Regards,

Shelwin