WebService Call Fails for Communication Users

Hi
I am calling a BAPI through web service in VB.NET windows application.
The application works fine with Dialog users but when I use Communication User then it thows this message.
The Request Failed with HTTP Status 401: Unauthorized
Where as if i call the same BAPI through RFC with for this Communication User it is successful.
What can be the reason ?
Regards
Rajendra

The Web Service uses the HTTP protocol, whereas the BAPI is using RFC protocol.
The reason for the "unauthorized" error in HTTP is that you need to embed the user / password combination into the web service URL (assuming you have set the Web Service authentication method to user / password).
Regards,
D.

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