Not every network on the internet allows traceroute through, so 'not reaching a host' using traceroute doesn't mean a lot. It's just filtered at some border router (my traceroutes end at 63.251.63.17, another pnap router), just like a lot of hosts do not allow ICMP pings through. There are still a lot of people who say that a host is dead just because it doesn't respond to pings.
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