hussam wroteDo Ogero http requests go through some proxy? if so, they could be using it to hardcode DNS requests.
I think they are filtering according to the host domain in the HTTP request. The IPs are accessible, so is google's DNS server, but neither of these workarounds solve the problem.
That is of course assuming that the filtering is happening in Lebanon. As I said it is possible that it is the website itself that would block traffic. Why they would do that, who knows.