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I am using the perl module Net::Ping to ping a set of remote hosts. I am using the default protocol, i.e. the tcp one. I am unable to ping 1 particular remote machine using this protocol.
Unix ping works fine, and so does the icmp protocol.
What could be the reason of this failure? Is there any setting I need to do on the host?
Probably firewall settings. ping-ish stuff is done via udp and icmp. tcp is overkill for that purpose, so they might block it, assuming the client is up to no good.