[Techtalk] Name Service Lookup Fails Under Wordpress

[Kai MacTane]

Wim De Smet wrote:
> 
> It is weird that it would work in the admin interface, if that is
> running in the exact same instance of your server. Might indeed be a
> PHP problem. Can you try doing a lookup from the cmdline (with dig)
> when it fails in PHP to see if everything resolves correctly?

I've hacked the class-IXR.php file to include the following inside the 
query() method, just before the fsockopen() call:

print "allow_url_fopen is: " . ini_get('allow_url_fopen') . "<br>\n<br>\n";
print "DiG returns:<br>\n<pre>";
passthru('dig www.dreamwidth.org');
print "</pre>\n";

This prints out a very normal-looking DiG response in the error page, 
right before the error message I've described before. Just in case it 
matters, here's the page, including the DiG output (though I suspect 
you'd get identical results from 'dig www.dreamwidth.org' on your own 
machine(s)):


allow_url_fopen is: 1

DiG returns:

; <<>> DiG 9.4.2 <<>> www.dreamwidth.org
;; global options:  printcmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 55419
;; flags: qr rd ra; QUERY: 1, ANSWER: 2, AUTHORITY: 5, ADDITIONAL: 4

;; QUESTION SECTION:
;www.dreamwidth.org.		IN	A

;; ANSWER SECTION:
www.dreamwidth.org.	470	IN	CNAME	dreamwidth.org.
dreamwidth.org.		470	IN	A	69.174.244.50

;; AUTHORITY SECTION:
dreamwidth.org.		86270	IN	NS	ns2.mydyndns.org.
dreamwidth.org.		86270	IN	NS	ns3.mydyndns.org.
dreamwidth.org.		86270	IN	NS	ns5.mydyndns.org.
dreamwidth.org.		86270	IN	NS	ns4.mydyndns.org.
dreamwidth.org.		86270	IN	NS	ns1.mydyndns.org.

;; ADDITIONAL SECTION:
ns4.mydyndns.org.	43316	IN	A	91.198.22.76
ns5.mydyndns.org.	43315	IN	A	203.62.195.76
ns3.mydyndns.org.	43315	IN	A	208.78.69.76
ns2.mydyndns.org.	43315	IN	A	204.13.249.76

;; Query time: 0 msec
;; SERVER: 127.0.0.1#53(127.0.0.1)
;; WHEN: Tue Jan 19 10:05:14 2010
;; MSG SIZE  rcvd: 229


Something went wrong getting the challenge string from host 
www.dreamhost.org - -32300 : transport error - could not open socket: 0 
php_network_getaddresses: getaddrinfo failed: Temporary failure in name 
resolution


> The contents of /etc/nsswitch.conf might be interesting too.

I don't think I've altered this from its OS default; here are the entire 
contents of the file. Thanks for helping with this.


#
# /etc/nsswitch.conf
#
# An example Name Service Switch config file. This file should be
# sorted with the most-used services at the beginning.
#
# The entry '[NOTFOUND=return]' means that the search for an
# entry should stop if the search in the previous entry turned
# up nothing. Note that if the search failed due to some other reason
# (like no NIS server responding) then the search continues with the
# next entry.
#
# Legal entries are:
#
#      nisplus or nis+         Use NIS+ (NIS version 3)
#      nis or yp               Use NIS (NIS version 2), also called YP
#      dns                     Use DNS (Domain Name Service)
#      files                   Use the local files
#      [NOTFOUND=return]       Stop searching if not found so far
#

# passwd: 	files nis
# shadow: 	files nis
# group:  	files nis

passwd: 	compat
group:  	compat

hosts:  	files dns
networks:       files

services:       files
protocols:      files
rpc:    	files
ethers: 	files
netmasks:       files
netgroup:       files
bootparams:     files

automount:      files
aliases:        files





-- 
Kai MacTane
LAMP, AJAX, and Ruby on Rails developer
http://kai.mactane.org