404. That’s an error.
The requested URL /add?source=atgs&feedurl=http://www.sitecore.net/learn/blogs/technical-blogs/alex-shyba/feed.aspx was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http://www.sitecore.net/learn/blogs/technical-blogs/alex-shyba/feed.aspx