I think your problem is 'getservbyname' is not returning what you think it is. This works fine for me (Win7 x64 / Strawberry 5.18.1):
VinsWorldcom@C:\Users\VinsWorldcom\tmp> cat test.pl
use strict;
use warnings;
use Net::Ping;
my $p = Net::Ping->new("tcp", 2);
printf "GetServByName = %s\n", getservbyname("http", "tcp");
# Explicitly use the HTTP port number
$p->port_number(80);
if ($p->ping("www.google.com")) {
print "Host is reachable\n";
} else {
print "Host is not reachable\n";
}
VinsWorldcom@C:\Users\VinsWorldcom\tmp> test.pl
GetServByName = http
Host is reachable
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