If I ping a Web site and get an error message that "Destination Host unreachable," does that mean that it is definitely behind a firewall or a router? If not, then what may be other possible causes?
This means that a router sent an error message back to you because it couldn't find the destination network. If you can get to other Web sites, then the problem is probably the fault of the people managing the Web site's network. If it's your Web site, treat it as a routing problem. Your first step in identifying the problem should be to use the pathping tool to ping the IP address. For example:
This should give you a list of routers between you and the Web site, and it should indicate where the problem is occurring.
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