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I have a 13" Macbook running Snow Leopard 10.6.6 which is unable to go to any URL on either my office or hotel networks.

I have no proxy or firewall enabled on the computer - and have connected to both networks in the past without issue.

If I ping, it responds with 'cannot resolve, unknown host' - however if I ping the IP it responds fine. I can also visit the IP in my browser and it goes to the page successfully.

I have rebooted, flushed my cache in several ways, tried to use Google's DNS (, all to no avail.

Any advice would be super!

share|improve this question
also, my /etc/hosts file looks as it always has – Dan Hunter Jun 29 '11 at 14:40
up vote 0 down vote accepted

I think it has to do with Bonjour (mDNSResponder). Check out this page.

Run the following command in a Terminal:

ps aux | grep mDNS

This should tell you whether or not /usr/sbin/mDNSResponder is running. If it is not, run the following command to launch it:

sudo /usr/sbin/mDNSResponder
share|improve this answer
Thanks Jon! mDNSResponder was running, so I unloaded then loaded it - following the instructions on the link you provided - and it works perfectly! – Dan Hunter Jun 29 '11 at 15:02
Glad to hear, Dan! Cheers! – Jon Jun 29 '11 at 15:14

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