Answer by R-TEC Guru for Current Observation feed from weather.gov forbidden (403)

That is great but you cant set "User-Agent" when you are using an XMLDocument and calling Load() Like this (this used to work):

        XmlDocument doc = new XmlDocument();        string stationName = @"http://w1.weather.gov/xml/current_obs/PASC.xml";        doc.Load(stationName);  // exception 403 occurs here now

Instead now you need to perform a GET and then set the User-Agent to your company or email and then use the XmlDocument like:

       XmlDocument doc = new XmlDocument();       string stationName = @"http://w1.weather.gov/xml/current_obs/PASC.xml";        HttpWebRequest request = (HttpWebRequest)WebRequest.Create(stationName);        request.Method = "GET";        request.ContentType = "application/x-www-form-urlencoded";        request.UserAgent = "MyApplication/v1.0 (http://foo.bar.baz; foo@bar.baz)";        request.Accept = "Accept=text/html,application/xhtml+xml,application/xml;q=0.9,*/*;q=0.8";        HttpWebResponse response = (HttpWebResponse)request.GetResponse();        Stream resStream = response.GetResponseStream();        doc.Load(resStream);        try        {            XmlNodeList list = doc.GetElementsByTagName("temp_f");            if (list.Count > 0)            {                float fTemperature = float.Parse(list.Item(0).InnerText);            }        }