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I can't get NSURLSession background tasks to use client certificates.I have a simple app that creates an NSURLSessionDownloadTask from an NSURLSession that uses NSURLSessionConfiguration.backgroundSessionConfigurationWithIdentifier(...).I have a custom delegate that implements:"func URLSession(session: NSURLSession, didReceiveChallenge challenge: NSURLAuthenticationChallenge, completionHandler: (NSURLSessionAuthChallengeDisposition, NSURLCredential?) -> Void)". For NSURLAuthenticationMethodServerTrust, I accept any server. For NSURLAuthenticationMethodClientCertificate, I have a hardcoded PKCS12 bundle with a single certificate and key from which I successfully create an NSURLCredential (using SecPKCS12Import), then pass that credential to the completion handler with .UseCredential.At runtime, I get the didReceiveChallenge callback for ClientCertificate, then another for NSURLAuthenticationMethodServerTrust, then URLSessionDidFinishEventsForBackgroundURLSession right away without completing the TLS handshake.If I change the NSURLSessionConfiguration to use NSURLSessionConfiguration.defaultSessionConfiguration(), the client cert is presented correctly and the download proceeds.Both tests are done with the app in the foreground.