Client can't access server?

I've got a client who was once able to view his website with no problems, now says he can't get to any site on my server. He gets similar error messages in both IE and Firefox:
* The site could be temporarily unavailable or too busy. Try again in a few
moments.

* If you are unable to load any pages, check your computer's network
connection.

* If your computer or network is protected by a firewall or proxy, make sure
that Firefox is permitted to access the Web.
When I asked him to ping the site, he said he got a request timed out.

Anyone got any suggestions? I'd really like to help him get up and running.

Thanks a lot,
-Ty Bartholomew

 

 

 

 

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