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Target of Invocation Error?

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We are using SAP as a backend, and have Web Services configured to connect with the front-end. Sorry, I cannot tell you much about the front-end, except, our .NET team developed it, and support it by using Sharepoint, and something called Quest Web Parts. Whenever the SAP back end importing or exporting parameters change, I send them a new WSDL file, so things go smoothly.

 

Every so often, when we do nothing to the mapping, SAP, or the front-end, we get this error message:

"The following error occurred: An error occurred while calling Web Service: Exception has been thrown by target of invocation"

 

Is there anyway to debug this? Or, better yet, does anyomne have any suggestions?

 

A couple of notes, the system has not been refreshed and passwords are OK.

 

Thank-You, Tom Matys


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