SSAS - configuration question

Hi Experts!
I have  a  SQL server set up configured for  reporting service function  which I want to access both locally and remotely.here is the example of the set up I currently have:
locally: http://localhost/reports/Data/Folder.aspx and
remotely :  http://xx.xx.xx.xx/reports/Pages/Folder.aspx

It works fine when I try to run it locally but when I try to run it remotely: I repeatedly get the login window and password: and it does not seem to recognise my credentials even after I repeatedly enter them.

Can someone help me in trying to solve the problem.

Please note I am a complete begginer in SSAS.

Thanks

Arun