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Invoking custom WCF service throws an Impersonation error from SQL

Posted By:      Posted Date: September 29, 2010    Points: 0   Category :SharePoint
 

I've written a custom WCF service and hosted it in SharePoint. Accessing the MEX endpoint works fine. However, when I try to invoke the WCF service from my client code, I get the following error:

'A transport-level error has occurred when sending the request to the server. (provider: Shared Memory Provider, error: 0 - Either a required impersonation level was not provided, or the provided impersonation level is invalid.)'.

This exception gets thrown even before my WCF service gets invoked. Attaching a debugger, I see the following stack trace associated with the exception:

00000000`0c2dd7d0 000007fe`e7589b95 System_Data_ni!System.Data.SqlClient.SqlConnection.OnError(System.Data.SqlClient.SqlException, Boolean)+0xd4
00000000`0c2dd810 000007fe`e7b7cd3b System_Data_ni!System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(System.Data.SqlClient.TdsParserStateObject)+0xf5
00000000`0c2dd870 000007fe`e758c4ee System_Data_ni!System.Data.SqlClient.TdsParserStateObject.WriteSni()+0x5f77ab
00000000`0c2dd8f0 000007fe`e758bf29 System_Data_ni!System.Data.SqlClient.TdsParserStateObject.ExecuteFlush()+0xae
00000000`0c2dd950 000007fe`e757a1c7 System_Data_ni!System.Data.SqlClient.TdsParser.TdsExecuteRPC(System.Data.SqlClient._SqlRPC[], Int32, Boolean, System.Data.Sql.SqlNotificationRequest, System.Data.SqlClient.TdsParserState


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I've written a custom WCF service and hosted it in SharePoint. Accessing the MEX endpoint works fine. However, when I try to invoke the WCF service from my client code, I get the following error: 'A transport-level error has occurred when sending the request to the server. (provider: Shared Memory Provider, error: 0 - Either a required impersonation level was not provided, or the provided impersonation level is invalid.)'. This exception gets thrown even before my WCF service gets invoked. Attaching a debugger, I see the following stack trace associated with the exception: 00000000`0c2dd7d0 000007fe`e7589b95 System_Data_ni!System.Data.SqlClient.SqlConnection.OnError(System.Data.SqlClient.SqlException, Boolean)+0xd4 00000000`0c2dd810 000007fe`e7b7cd3b System_Data_ni!System.Data.SqlClient.TdsParser.ThrowExceptionAndWarning(System.Data.SqlClient.TdsParserStateObject)+0xf5 00000000`0c2dd870 000007fe`e758c4ee System_Data_ni!System.Data.SqlClient.TdsParserStateObject.WriteSni()+0x5f77ab 00000000`0c2dd8f0 000007fe`e758bf29 System_Data_ni!System.Data.SqlClient.TdsParserStateObject.ExecuteFlush()+0xae 00000000`0c2dd950 000007fe`e757a1c7 System_Data_ni!System.Data.SqlClient.TdsParser.TdsExecuteRPC(System.Data.SqlClient._SqlRPC[], Int32, Boolean, System.Data.Sql.SqlNotificationRequest, System.Data.SqlClient.TdsParserStateObject, Boolean)+0x1189 00000000`0c2ddbf

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Hi,

I'm reading a book by Sahil Malik on building solutions for SharePoint 2010 (from Apress).
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I followed the steps as given in the book, but when I try to open the URL to the service, I get this error:

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I have to mention that when I added the mapped ISAPI folder to my VS project, it didn't create the project subfolder automatically and I accidently created my files (svc and web.config) on the root level of the ISAPI folder. I created the subfolder manually and moved these two files in the subfolder, but it doesn't seem to work. Maybe I overwrote something on the root of ISAPI ?

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