404. That’s an error.
The requested URL /add?source=atgs&feedurl=http%3A//xn--kck8a7dk5g5e5477clcxa.com/rss.xml was not found on this server. That’s all we know.
/add?source=atgs&feedurl=http%3A//xn--kck8a7dk5g5e5477clcxa.com/rss.xml