Oh - Vista.

OK. Go get TCPView from Microsoft

http://technet.microsoft.com/en-us/sysinternals/bb897437

When you run it, your OS will probably ask permission like 511 times. Say yes, please.

Then sort by Local Port again, and look for Poser.exe on the two ports I listed.

This tool won't show firewall status, but it will at least show us if something else has stolen the port.

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)