got "BAD (HORIZONTAL) REFERRAL" error

[jeff at faisco.com]

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hi all, i have setup a bind server,  host the zone faisco.com, and work fine several daysbut one of my new client said that they can't resolve my domain, meanwhile they can resolve other web site without any problem.i run 'dig' on their machine, this is the result:; <<>> DiG 9.4.0 <<>> www.faisco.com +trace;; global options: printcmd. 3600 IN NS m.root-servers.net.. 3600 IN NS l.root-servers.net.. 3600 IN NS k.root-servers.net.. 3600 IN NS j.root-servers.net.. 3600 IN NS i.root-servers.net.. 3600 IN NS h.root-servers.net.. 3600 IN NS g.root-servers.net.. 3600 IN NS f.root-servers.net.. 3600 IN NS e.root-servers.net.. 3600 IN NS d.root-servers.net.. 3600 IN NS c.root-servers.net.. 3600 IN NS b.root-servers.net.. 3600 IN NS a.root-servers.net.;; Received 417 bytes from 192.168.0.10#53(192.168.0.10) in 0 mscom. 165333 IN NS g.gtld-servers.net.com. 165333 IN NS h.gtld-servers.net.com. 165333 IN NS i.gtld-servers.net.com. 165333 IN NS j.gtld-servers.net.com. 165333 IN NS k.gtld-servers.net.com. 165333 IN NS l.gtld-servers.net.com. 165333 IN NS m.gtld-servers.net.com. 165333 IN NS a.gtld-servers.net.com. 165333 IN NS b.gtld-servers.net.com. 165333 IN NS c.gtld-servers.net.com. 165333 IN NS d.gtld-servers.net.com. 165333 IN NS e.gtld-servers.net.com. 165333 IN NS f.gtld-servers.net.;; Received 464 bytes from 192.203.230.10#53(e.root-servers.net) in 284 mscom. 165333 IN NS g.gtld-servers.net.com. 165333 IN NS h.gtld-servers.net.com. 165333 IN NS i.gtld-servers.net.com. 165333 IN NS j.gtld-servers.net.com. 165333 IN NS k.gtld-servers.net.com. 165333 IN NS l.gtld-servers.net.com. 165333 IN NS m.gtld-servers.net.com. 165333 IN NS a.gtld-servers.net.com. 165333 IN NS b.gtld-servers.net.com. 165333 IN NS c.gtld-servers.net.com. 165333 IN NS d.gtld-servers.net.com. 165333 IN NS e.gtld-servers.net.com. 165333 IN NS f.gtld-servers.net.;; BAD (HORIZONTAL) REFERRAL;; Received 464 bytes from 192.41.162.30#53(l.gtld-servers.net) in 383 mscom. 165333 IN NS g.gtld-servers.net.com. 165333 IN NS h.gtld-servers.net.com. 165333 IN NS i.gtld-servers.net.com. 165333 IN NS j.gtld-servers.net.com. 165333 IN NS k.gtld-servers.net.com. 165333 IN NS l.gtld-servers.net.com. 165333 IN NS m.gtld-servers.net.com. 165333 IN NS a.gtld-servers.net.com. 165333 IN NS b.gtld-servers.net.com. 165333 IN NS c.gtld-servers.net.com. 165333 IN NS d.gtld-servers.net.com. 165333 IN NS e.gtld-servers.net.com. 165333 IN NS f.gtld-servers.net.;; BAD (HORIZONTAL) REFERRAL;; Received 464 bytes from 192.26.92.30#53(c.gtld-servers.net) in 329 mscom. 165333 IN NS g.gtld-servers.net.com. 165333 IN NS h.gtld-servers.net.com. 165333 IN NS i.gtld-servers.net.com. 165333 IN NS j.gtld-servers.net.com. 165333 IN NS k.gtld-servers.net.com. 165333 IN NS l.gtld-servers.net.com. 165333 IN NS m.gtld-servers.net.com. 165333 IN NS a.gtld-servers.net.com. 165333 IN NS b.gtld-servers.net.com. 165333 IN NS c.gtld-servers.net.com. 165333 IN NS d.gtld-servers.net.com. 165333 IN NS e.gtld-servers.net.com. 165333 IN NS f.gtld-servers.net.;; BAD (HORIZONTAL) REFERRAL;; Received 464 bytes from 192.5.6.30#53(a.gtld-servers.net) in 466 mscom. 165333 IN NS g.gtld-servers.net.com. 165333 IN NS h.gtld-servers.net.com. 165333 IN NS i.gtld-servers.net.com. 165333 IN NS j.gtld-servers.net.com. 165333 IN NS k.gtld-servers.net.com. 165333 IN NS l.gtld-servers.net.com. 165333 IN NS m.gtld-servers.net.com. 165333 IN NS a.gtld-servers.net.com. 165333 IN NS b.gtld-servers.net.com. 165333 IN NS c.gtld-servers.net.com. 165333 IN NS d.gtld-servers.net.com. 165333 IN NS e.gtld-servers.net.com. 165333 IN NS f.gtld-servers.net.;; BAD (HORIZONTAL) REFERRAL;; Received 464 bytes from 192.12.94.30#53(e.gtld-servers.net) in 383 mslots of 'BAD (HORIZONTAL) REFERRAL'???and the correct result should be like this:; <<>> DiG 9.4.0 <<>> www.faisco.com +trace;; global options: printcmd. 43757 IN NS a.root-servers.net.. 43757 IN NS b.root-servers.net.. 43757 IN NS c.root-servers.net.. 43757 IN NS d.root-servers.net.. 43757 IN NS e.root-servers.net.. 43757 IN NS f.root-servers.net.. 43757 IN NS g.root-servers.net.. 43757 IN NS h.root-servers.net.. 43757 IN NS i.root-servers.net.. 43757 IN NS j.root-servers.net.. 43757 IN NS k.root-servers.net.. 43757 IN NS l.root-servers.net.. 43757 IN NS m.root-servers.net.;; Received 228 bytes from 192.168.1.254#53(192.168.1.254) in 156 mscom. 172800 IN NS g.gtld-servers.net.com. 172800 IN NS l.gtld-servers.net.com. 172800 IN NS k.gtld-servers.net.com. 172800 IN NS f.gtld-servers.net.com. 172800 IN NS d.gtld-servers.net.com. 172800 IN NS c.gtld-servers.net.com. 172800 IN NS a.gtld-servers.net.com. 172800 IN NS e.gtld-servers.net.com. 172800 IN NS h.gtld-servers.net.com. 172800 IN NS j.gtld-servers.net.com. 172800 IN NS i.gtld-servers.net.com. 172800 IN NS m.gtld-servers.net.com. 172800 IN NS b.gtld-servers.net.;; Received 504 bytes from 192.203.230.10#53(e.root-servers.net) in 531 msfaisco.com. 172800 IN NS dns1.faisco.cn.faisco.com. 172800 IN NS dns2.faisco.cn.;; Received 79 bytes from 192.12.94.30#53(e.gtld-servers.net) in 343 mswww.faisco.com. 86400 IN CNAME serv01.faisco.com.serv01.faisco.com. 86400 IN A 119.120.92.213faisco.com. 86400 IN NS dns1.faisco.cn.faisco.com. 86400 IN NS dns2.faisco.cn.;; Received 116 bytes from 58.255.252.149#53(dns2.faisco.cn) in 203 mscan any one help ? thanks!