404. That’s an error.
The requested URL /add?source=atgs&feedurl=http%3A//server.selltec.com/go/dkv/_ws/rss/news/standard/feeds.xml was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http%3A//server.selltec.com/go/dkv/_ws/rss/news/standard/feeds.xml