Mac OSX: clear DNS Cache
Sometimes it happens that a Website that changes your Host IP. Your System has stored the old IP of the page, run your DNS requests into the Void. Therefore, you need to empty in this case, the DNS Cache:
- You search in Spotlight for "Terminal" and run the program.
- For OSX 10.6 Snow Leopard or earlier, you must type the command "sudo dscacheutil-flush cache" (without the quotation marks).
- In OSX Lion and up, the command varies, you have to type in "sudo killall-HUP mDNSResponder".

Mac OSX Terminal
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