Problem with url open

Code

[code=php]<?php

if (file_get_contents(“http://example.com/”)){
echo “Working!”;
}else{
echo “Why, why, why?”;
}

?>[/code]

For some reason I get error_message [B]Warning: file_get_contents([url]http://example.com/[/url]) [function.file-get-contents]: failed to open stream: Host is down in[/B].

Tried it without my own firewall.
In php.ini:
allow_url_fopen = On
safe_mode = Off

What is could be cousing this problem?

(And yes, I have tried it with n-number of url -> not working at my home computer, but works perfectly at server; so the problem is definetly at my computer, but…?)

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