Some of my co-workers are having troubles on their Macs - DNS resolution does not work in Mac OS X. They're running Snow Leopard 10.6.8. They can use DNS in a Windows 7 virtual machine (VMware Fusion 3.1.3) running on OS X. The computers are 15" MacBook Pros, early 2011 model.
Things they've tried that didn't work:
- turning airport on/off
- rebooting
- using wired connection instead of wifi
- deleting connection credentials and adding it again
- turning off Mac firewall
- using static IP
- manually setting DNS servers
- restarting mDNSResponder
- the fixes from this other question
EDIT response to Martín's answer:
• Can you ping the DNS you want to use?
$ ping apple.com
ping: cannot resolve apple.com: Unknown host
• What is/are the IP address(es) of the DNS(s) you want to use?
This is a company DNS server that is given with DHCP, it works well for other people. I've also tried Google's 8.8.4.4 and 205.171.3.65 (which I found from GRC's DNS Benchmark to be the fastest).
• Have you tried using 8.8.8.8 (google) or any of the OpenDNS 208.67.222.222 or 208.67.220.220?
It doesn't work, see Google Chrome output:
The server at www.apple.com can't be found, because the DNS lookup failed. DNS is the network service that translates a website's name to its Internet address. This error is most often caused by having no connection to the Internet or a misconfigured network. It can also be caused by an unresponsive DNS server or a firewall preventing Google Chrome from accessing the network.
• Can you ping those hosts?
$ ping 8.8.8.8
PING 8.8.8.8 (8.8.8.8): 56 data bytes 64 bytes from
8.8.8.8: icmp_seq=0 ttl=58 time=3.925 ms
• creating a blank user
A guest user account was created, the DNS issue was still there when using the guest account.
• nslookup and dig both work fine
$ nslookup www.apple.com 8.8.8.8
Server: 8.8.8.8
Address: 8.8.8.8#53
Non-authoritative answer:
www.apple.com canonical name = www.isg-apple.com.akadns.net.
www.isg-apple.com.akadns.net canonical name = www.apple.com.edgekey.net.
www.apple.com.edgekey.net canonical name = e3191.c.akamaiedge.net.
Name: e3191.c.akamaiedge.net
Address: 184.24.141.15
$ dig @8.8.8.8 www.apple.com
; <<>> DiG 9.6.0-APPLE-P2 <<>> @8.8.8.8 www.apple.com
; (1 server found)
;; global options: +cmd
;; Got answer:
;; ->>HEADER<<- opcode: QUERY, status: NOERROR, id: 11298
;; flags: qr rd ra; QUERY: 1, ANSWER: 4, AUTHORITY: 0, ADDITIONAL: 0
;; QUESTION SECTION: ;www.apple.com. IN A
;; ANSWER SECTION:
www.apple.com. 1041 IN CNAME www.isg-apple.com.akadns.net.
www.isg-apple.com.akadns.net. 38 IN CNAME www.apple.com.edgekey.net.
www.apple.com.edgekey.net. 8794 IN CNAME e3191.c.akamaiedge.net.
e3191.c.akamaiedge.net. 17 IN A 184.24.141.15
;; Query time: 4 msec
;; SERVER: 8.8.8.8#53(8.8.8.8)
;; WHEN: Tue Oct 4 09:25:28 2011
;; MSG SIZE rcvd: 158
• also flushing the DNS cache was done but it didn't help
sudo dscacheutil -flushcache
sudo killall -HUP mDNSResponder
EDIT 2:
$ cat /etc/resolv.conf
#
# Mac OS X Notice
#
# This file is not used by the host name and address resolution
# or the DNS query routing mechanisms used by most processes on
# this Mac OS X system.
#
# This file is automatically generated.
#
domain {redacted}.com
nameserver 8.8.8.8
nameserver 208.67.222.222
sudo dscacheutil -flushcache sudo killall -HUP mDNSResponder