NSURLErrorDomain error - 999 on iOS with OAuth2

[Iyashu5040]

When using OAuth2Authenticator to login with facebook on iOS an error message keeps popping up with a description that says there is an NSURLErrorDomain error - 999. This message repeatedly pops up, making login almost impossible. At the moment I've created my own version of Xamarin.Auth that ignores that specific error code and I'm having no trouble logging in. The overridden LoadFailed method in the WebViewDelegate in WebAuthenticatorController can be changed as follows:

public override void LoadFailed(UIWebView webView, NSError error)
    {
    controller.activity.StopAnimating();

                webView.UserInteractionEnabled = true;

                if (error.Code != -999)
                {
                    controller.poster.OnError(error.LocalizedDescription);
                }
     }

I've adapted the solution from this forum thread on the Apple Support Community: https://discussions.apple.com/thread/1727260