Work book save error in SAP business objects in bi platform

Hi,

We are facing issue for saving workbook in SAP Business objects in bi platform.

                         While saving work book it's asking user id and passowrd and webservice URL. after entering this it's asking to enter proxy user and passowrd.

Please suggest what is the proxy id and password we need to give here or any configuration we need to do to connect workbook with sap business objects.

Error: Proxy error 407 and Authorization failure.

##Screen shot attached##

Thanks & Regards,

Sreekanth Reddy