On 16/05/14 05:38, Yossi Eskenazi wrote:
but there are many domains which cannot get through. The problem appeared rather recently, so I suspect that an update in a firewall brand, or a dns server update is causing this.
Almost certainly not. It's very likely your network provider or one of their upstreams put this block in, in response to a reflection attack; many attackers sems to use queries for isc.org (and others) for some reason.
Ask your provider what they've done, and to exclude you from it (better yet, fix their broken filter)
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