Question

I have a WCF service, hosted in IIS 7.0 that needs to run database queries. In order to get the right permissions to do this I am impersonating within the service as follows:

Code

[OperationBehavior(Impersonation = ImpersonationOption.Allowed)] public void MyOperation(int arg) 

Configuration

<behavior name='ReceivingServiceBehavior'>     <!-- Other behaviors -->     <serviceAuthorization impersonateCallerForAllOperations='true' /> </behavior> 

When I try to connect and run my query I get the following:

 Exception - System.IO.FileLoadException: Could not load file or assembly 'System.Transactions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' or one of its dependencies. Either a required impersonation level was not provided, or the provided impersonation level is invalid. (Exception from HRESULT: 0x80070542)  File name: 'System.Transactions, Version=2.0.0.0, Culture=neutral, PublicKeyToken=b77a5c561934e089' ---> System.Runtime.InteropServices.COMException (0x80070542): Either a required impersonation level was not provided, or the provided impersonation level is invalid. (Exception from HRESULT: 0x80070542)    at System.Data.Linq.SqlClient.SqlConnectionManager.UseConnection(IConnectionUser user)    at System.Data.Linq.SqlClient.SqlProvider.get_IsSqlCe()    at System.Data.Linq.SqlClient.SqlProvider.InitializeProviderMode()    at System.Data.Linq.SqlClient.SqlProvider.System.Data.Linq.Provider.IProvider.Execute(Expression query)    at System.Data.Linq.DataQuery`1.System.Collections.Generic.IEnumerable.GetEnumerator()    at System.Linq.Buffer`1..ctor(IEnumerable`1 source)    at System.Linq.Enumerable.ToArray[TSource](IEnumerable`1 source)    at Fourth.GHS.MessageRelay.RegistrationDBStorage.FindRegistration(SystemKey key) 

Answer 1

If you want the SQL queries to be executed as the impersonated identity, you may actually need to enable delegation to your SQL server. Check out this article for more info:

http://msdn.microsoft.com/en-us/library/ms730088.aspx