Logging Username With Elmah For WCF Webservices?

We are using the approach described here to log our webservice errors with Elmah. And this actually works, but sadly the username beeing logged is empty.

We did some debugging and found, that when logging the error in the ErrorHandler the HttpContext.Current.User has the correct User set.

We also tried:

HttpContext context = HttpContext.Current;
ErrorLog.GetDefault(context).Log(new Error(pError, context));

and

ErrorLog.GetDefault(null).Log(new Error(pError));

Without success.

how we can make Elmah log the username?

On a sidenote, when logging the error directly within the Webservice, the username is logged as expected. But taking this approach is not very DRY.