domain 'state.gov' resolve time out

[shen Jason]

hi.guy:
  recently,I resolve this domain 'state.gov'in my dns servers,the first 
server can resolve,but the second server resolve time out:
; <<>> DiG 9.3.2 <<>> state.gov
;; global options:  printcmd
;; connection timed out; no servers could be reached
I use dig state.gov +trace ,receive below reply:

; <<>> DiG 9.3.2 <<>> state.gov +trace
;; global options:  printcmd
.                       3078    IN      NS      G.ROOT-SERVERS.NET.
.                       3078    IN      NS      H.ROOT-SERVERS.NET.
.                       3078    IN      NS      I.ROOT-SERVERS.NET.
.                       3078    IN      NS      J.ROOT-SERVERS.NET.
.                       3078    IN      NS      K.ROOT-SERVERS.NET.
.                       3078    IN      NS      L.ROOT-SERVERS.NET.
.                       3078    IN      NS      M.ROOT-SERVERS.NET.
.                       3078    IN      NS      A.ROOT-SERVERS.NET.
.                       3078    IN      NS      B.ROOT-SERVERS.NET.
.                       3078    IN      NS      C.ROOT-SERVERS.NET.
.                       3078    IN      NS      D.ROOT-SERVERS.NET.
.                       3078    IN      NS      E.ROOT-SERVERS.NET.
.                       3078    IN      NS      F.ROOT-SERVERS.NET.
;; Received 372 bytes from 127.0.0.1#53(127.0.0.1) in 3 ms

gov.                    172800  IN      NS      B.GOV.ZONEEDIT.COM.
gov.                    172800  IN      NS      C.GOV.ZONEEDIT.COM.
gov.                    172800  IN      NS      D.GOV.ZONEEDIT.COM.
gov.                    172800  IN      NS      E.GOV.ZONEEDIT.COM.
gov.                    172800  IN      NS      F.GOV.ZONEEDIT.COM.
gov.                    172800  IN      NS      G.GOV.ZONEEDIT.COM.
gov.                    172800  IN      NS      A.GOV.ZONEEDIT.COM.
;; Received 267 bytes from 192.112.36.4#53(G.ROOT-SERVERS.NET) in 439 ms

state.gov.              86400   IN      NS      DNSAUTH3.SYS.GTEI.NET.
state.gov.              86400   IN      NS      dnsauth1.SYS.GTEI.NET.
state.gov.              86400   IN      NS      dnsauth2.SYS.GTEI.NET.
;; Received 108 bytes from 206.51.224.229#53(B.GOV.ZONEEDIT.COM) in 684 ms

;; connection timed out; no servers could be reached
somebody could help me? thanks in advance!

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