Sometimes it can be useful to flush the DNS cache held on your computer. The DNS cache maintains a local cache of mappings between hostnames and ip addresses. So, if either of those change, for example if you change hosting providers, your local DNS cache can get out of date.  The DNS cache will flush itself automatically, but if you need to flush it immediately, open a terminal shell and enter the following:
~ $> dscacheutil -flushcache
This command works on Leopard (10.5) and Snow Leopard (10.6). To flush the cache on Tiger (10.4), open a terminal and execute the following command:
~ $> lookupd -flushcache
3/27/2012 06:17:29 am

Great info, thanks

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6/12/2012 10:52:43 pm

Well, very good post with informative information. I really appreciate the fact that you approach these topics from a stand point of knowledge and information.

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7/14/2012 08:37:30 pm

THX for info

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