I've got an Intel i3 iMac and just did a fresh reload of Snow Leopard this week. The first time I went to use the WHOIS command, it did not work. It only seems to hang, never spitting out any information about the domain I give it. Code: $ whois google.com Whois Server Version 2.0 Domain names in the .com and .net domains can now be registered with many different competing registrars. Go to http://www.internic.net for detailed information. This works fine on other systems on the network, and I don't have any software installed on this Mac that I think would cause this. Here are a couple of things I've tried: Set the Mac to use DHCP, because the other systems I've tried are in the DHCP IP pool. Set the other working machines to source-nat using the same public IP that I use for this Mac, and they continued to work even after clearing local DNS caches. Disabled IPv6 (I do use this normally, and have never had any issues). This machine replaced a MacBook Pro which never have me any issues. It used the same private and public IP addresses, and nothing has changed in the router firewalls. I use this command all the time, and I don't want to have to keep using SSH or the web to do a WHOIS lookup. Please help!