I'm administering a Fedora 12 box, but am quite new to networking specifics. Recently one of our WordPress apps hosted on our server has stopped being able to perform its auto-update or auto-download of plugins.

Investigating further, I have tried the following:

$ wget wordpress.org
--2010-12-17 11:26:50--  http://wordpress.org/
Resolving wordpress.org... failed: Temporary failure in name resolution.
wget: unable to resolve host address âwordpress.orgâ

Whereas:

$ wget www.google.com
--2010-12-17 11:27:26--  http://www.google.com/
Resolving www.google.com... 74.125.226.82, 74.125.226.84, 74.125.226.80, ...
Connecting to www.google.com|74.125.226.82|:80... connected.
HTTP request sent, awaiting response... 302 Found
Location: http://www.google.ca/ [following]
--2010-12-17 11:27:26--  http://www.google.ca/
Resolving www.google.ca... 173.194.32.104
Connecting to www.google.ca|173.194.32.104|:80... connected.
HTTP request sent, awaiting response... 200 OK
Length: unspecified [text/html]
Saving to: âindex.html.4â

    [ <=>                                                                                                        ] 9,079       --.-K/s   in 0.02s

2010-12-17 11:27:26 (462 KB/s) - âindex.html.4â

Interestingly:

$ ping wordpress.org
PING wordpress.org (72.233.56.138) 56(84) bytes of data.
64 bytes from wordpress.org (72.233.56.138): icmp_seq=1 ttl=50 time=81.5 ms
64 bytes from wordpress.org (72.233.56.138): icmp_seq=2 ttl=50 time=67.3 ms
^C
--- wordpress.org ping statistics ---
2 packets transmitted, 2 received, 0% packet loss, time 1783ms
rtt min/avg/max/mdev = 67.361/74.448/81.536/7.092 ms

and

$ nslookup wordpress.org
Server:         192.168.2.1
Address:        192.168.2.1#53

Non-authoritative answer:
Name:   wordpress.org
Address: 72.233.56.138
Name:   wordpress.org
Address: 72.233.56.139

nscd has been stopped and flushed. iptables appear to be clean. At this point I have exhausted my limited abilities to diagnose the issue. Can anyone suggest a resolution path?