Sometimes a bad DNS entry will be cached and you will need to either flush the DNS cache to get rid of it, or wait up to 24 hours for it to be dropped from the cache automatically. You can however FORCE the flush from the system!

 In Microsoft Windows, you can use the command ipconfig /flushdns to flush the DNS resolver cache. C:\\ipconfig /flushdns

In Mac OSX, you can use the command lookupd -flushcache to flush the DNS resolver cache. bash-2.05a$ lookupd -flushcache 

In Linux, the nscd daemon manages the DNS cache. To flush the DNS cache, restart the nscd daemon. To restart the nscd daemon, use the command `/etc/rc.d/init.d/nscd restart`.

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