Currently I'm facing an problem. I tried to use hostTracker.com to test on domain name hosted in my server, the results show more than 30 failed connections. (Failure("Domain lookup failure:example.com Exception:Not_found") However, when I try to run a test on ip, which the ip bind with nameserver, there are zero failed connections, which means everything is fine. I'm not sure what is the problems, anyone could give me some hints on how to solve the problem please?