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Cannot call a web service method - Connect to Web Service failed, please login again (2012)

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SYMPTOMS
When invoking the web service API via XML to retrieve data, an error message occurs.

ERROR
Connect to Web Service failed, please login agin.

REASON
In order to use a web service method, a valid user id (=ResourceId) and authentication token need to be provided in the SOAP header.

RESOLUTION
Call the login method in wslogin.asmx, providing a Changepoint username and password. The ResourceId and the access token, to be used in further web service calls, are then returned.