Dirk, from what I can gather this port is for plug n play devices.
Yesterday I had the same problem as you when running port scan tests(I'd installed a new firewall and wanted to test it), it showed this port was open/not stealthed.
I resolved this problem by altering my firewall settings. If you have a firewall that you can change settings for what processes/programs have access to the internet, allow the generic host process service to send to the internet but deny it access to receive(normally called "in" in the firewall security options). As I understand it this shouldn't cause any problems and after I had done this and ran the port scan tests again my system was totally stealthed(doing this didn't just stealth port 5000 but I had other ports shown as open and they were stealthed as well).
Hope this helps/cures your problem.
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