problem accessing web service in Navision 2009

I istalled the Nav 2009,

NAV Server and Nav Business web services and role tailored client in one machine (Windows 2003 Server intalled on that machine).

I published a web service. Its runs on the browser like

http://localhost:7047/DynamicsNAV/WS/CRONUS_International_Ltd./Services

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But when i give the manchine name instead of local host then it ask me for user name and password

http://Machine:7047/DynamicsNAV/WS/CRONUS_International_Ltd./Services

then User name and password window popup.

I need to access web service in windows application.

Thanks