string RSSURL = "http://zakupki.gov.ru/tinyurl/6a6ae7ed-e77d-4572-b7ac-43856452b2f6";
WebClient wclient = new WebClient(); //method 1
string RSSData = wclient.DownloadString(RSSURL);
XDocument xml = XDocument.Parse(RSSData);
var xmlReader = XmlReader.Create(RSSURL);//method 2. Both 404
It should be noted that the resource zakupki.gov.ru
is very specific, with other channels these methods work well.
A few nuget libraries I've seen are also working through xmlReader
. That is, they can not solve this problem
this library helped me https://www.nuget.org/packages/CodeHollow.FeedReader/ 1234567