Impersonate core service in Tridion 2011 SP1 HR1 - tridion

Question

I am trying to impersonate the Core Service in Tridion 2011 SP1 HR1 and I get this error:
The message could not be processed because the action
'http://www.sdltridion.com/ContentManager/CoreService/2011/ISessionAwareCoreService/Impersonate' is invalid or unrecognized.
Why does this happen? I have to be blind to not see why it isn't working...
About the server: new installation of Tridion 2011 SP1 HR1
My code looks like this:
client = Client.GetCoreService();
if (string.IsNullOrEmpty(username)) username = HttpContext.Current.User.Identity.Name;
client.Impersonate(username);
and this is the GetCoreService method:
public static SessionAwareCoreServiceClient GetCoreService()
{
AppSettingsReader reader = new AppSettingsReader();
string coreServiceUrl = (string)reader.GetValue("CoreServiceEndPoint", typeof(string));
int dataSize = (int)reader.GetValue("DataSize", typeof(int));
var quotas = new System.Xml.XmlDictionaryReaderQuotas
{
MaxStringContentLength = dataSize,
MaxArrayLength = dataSize,
MaxBytesPerRead = dataSize
};
var httpBinding = new WSHttpBinding
{
MaxReceivedMessageSize = 10485760,
ReaderQuotas = quotas,
Security = { Mode = SecurityMode.Message, Transport = { ClientCredentialType = HttpClientCredentialType.Windows } }
};
var endpoint = new EndpointAddress(coreServiceUrl);
var result = new SessionAwareCoreServiceClient(httpBinding, endpoint);
return result;
}
extract from appsettings (replaced actual hostname with "hostname"):
<add key="CoreServiceEndPoint" value="http://hostname/WebServices/CoreService.svc/wsHttp_2010" />
<add key="DataSize" value="41943040" />

Answer 1

Take a look at this sample from an open source project for notification which does what you need
http://code.google.com/p/tridion-notification-framework/source/browse/NotificationService/NotificationService/CoreService/Client.cs
Here is the working line which impersonates
public static SessionAwareCoreServiceClient GetCoreService()
{
var result = GetNewClient<SessionAwareCoreServiceClient>();
result.Impersonate(ConfigurationManager.AppSettings.Get("adminUser"));
return result;
}
Also take a look at the way the client is created in the sample in the same CS file, and the App Settings. I think you are using an old endpoint address, it should be http://hostname/webservices/CoreService2011.svc/wsHttp rather than http://hostname/WebServices/CoreService.svc/wsHttp_2010

Answer 2

You are connecting to an old Core Service wsHttp endpoint.
If you are using the 2011 SP1 client, you need to connect to the following endpoint instead:
http://hostname/webservices/CoreService2011.svc/wsHttp