Too often have I seen cashed-DNS problems, especially after a network maintenance period, IP update, or even domain transfer - where the client's think their websites are down.
This website will tell you if a website is down, or not: http://www.downforeveryoneorjustme.com
Another useful website to use, to check if a website is working like it should, or if the updates you have applied is there (but your PC or ISP's cache is not showing the changes) is http://www.proxify.com
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