404. That’s an error.
The requested URL /add?feedurl=http%3A//xn--fbkq837trvbe7ir9xy92ahximr8a690a.rwuhn.com/atom.xml was not found on this server. That’s all we know.
/add?feedurl=http%3A//xn--fbkq837trvbe7ir9xy92ahximr8a690a.rwuhn.com/atom.xml