The root servers are pointing to 216.177.19.108 for seanspc.net but the DNS server at 216.177.19.108 is not answering at this time. Is port 53 firewalled?
$ dig @a.gtld-servers.net
www.seanspc.net
; <<>> DiG 9.3.1 <<>> @a.gtld-servers.net
www.seanspc.net
; (2 servers found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 52422
;; flags: qr rd; QUERY: 1, ANSWER: 0, AUTHORITY: 2, ADDITIONAL: 2
;; QUESTION SECTION:
;
www.seanspc.net. IN A
;; AUTHORITY SECTION:
seanspc.net. 172800 IN NS ns1.seanspc.net.
seanspc.net. 172800 IN NS ns2.seanspc.net.
;; ADDITIONAL SECTION:
ns1.seanspc.net. 172800 IN A 216.177.19.108
ns2.seanspc.net. 172800 IN A 216.177.19.108
;; Query time: 190 msec
;; SERVER: 192.5.6.30#53(192.5.6.30)
;; WHEN: Sun Sep 18 02:03:07 2005
;; MSG SIZE rcvd: 101
$ dig @216.177.19.108
www.seanspc.net
; <<>> DiG 9.3.1 <<>> @216.177.19.108
www.seanspc.net
; (1 server found)
;; global options: printcmd
;; connection timed out; no servers could be reached
Reverse lookup for 216.177.19.108 is not delegated. You should talk to your ISP about getting reverse-lookup for your netblock delegated to 216.177.19.108, particularly if you intend to run a mail server as many mail server admins block 'no rDNS' connections as an antispam measure.
$ dig @a.root-servers.net 216.177.19.108
; <<>> DiG 9.3.1 <<>> @a.root-servers.net 216.177.19.108
; (1 server found)
;; global options: printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NXDOMAIN, id: 39629
;; flags: qr aa rd; QUERY: 1, ANSWER: 0, AUTHORITY: 1, ADDITIONAL: 0
;; QUESTION SECTION:
;216.177.19.108. IN A
;; AUTHORITY SECTION:
. 86400 IN SOA A.ROOT-SERVERS.NET. NSTLD.VERISIGN-GRS.COM. 2005091701 1800 900 604800 86400
;; Query time: 185 msec
;; SERVER: 198.41.0.4#53(198.41.0.4)
;; WHEN: Sun Sep 18 02:06:56 2005
;; MSG SIZE rcvd: 107