IMac and internet connection issue

Dear Forum members,
I have a number of iMac's. However on one of them when a try and connect to a certain site, I get "Safari can't connect to server" message. It also says safari can't open the page "http://www.somewebsite.com/" because Safari can't connect to the server "www.somewebsite.com".
Please note www.somewebsite.com is just a made up name.
When I googled around it seems to indicate a firewall is blocking this URL. So I did the following:
Make sure OSX firewall is turned off - it always was.
Tried to flush the cache by typing dscacheutil -flushcache but to no avail.
Tried accessing using Firefox - same result
Any suggestions on how I can fix this issue.
I am running OSX Version 10.7.2, Safari 5.1.2
Thanks
Max

Everyone I found the answer after I posted my own comment re localhost...got me thinking.
I checked /etc/hosts file and in there was a loopback to localhost
127.0.0.1     somewebsite.com
WOW...how the heck did that get entered as I never edited this file??
Now all works fine.
Thanks everyone for your assistance.
Here is a link to where I originally found the clue

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