> traceroute is a special implementation of PING, and PING does not
>> access an arbitrary port. The general usage of PING and traceroute is
>> to verify a routing path to a specific IP-ADDRESS, not a port on that >> host.
>
> On the contrary, traceroute can be told to send it's UDP queries to a
> specific port. Thus it would be possible to see which host / firewall
> is blocking access. At least this is the case on Slackware Linux. >
>
regardless, the application listening on said port must be willing to reply according to the ICMP protocol, which is highly unlikely.
just try it on ports 80 or 443 :)