Not all ports are stealthed

I ran the onlin Shields Up! port scan, and it found three ports that aren't fully stealthed: 20, 21 (the ftp ports), and 500 (the vpn port).
I'm not running any internet services like ftp and am not using a vpn. My osx firewall is on, set to stealth mode. The two exceptions I have set up for the software firewall are for ports above 50,000. The hardware firewall in my dsl router is also turned on. The only port forwarding is for those that I have have the software exceptions.
I've tried turning passive ftp on and off and it doesn't make a difference.
Any thoughts?

OK, I see your point now.
Still no idea why I get a different reading every time on Shields Up, (possibly my slow Dial-up), whereas this one always has a consistent report...
http://www.pcflank.com/scanner_s1.htm
ShieldsUp...
ShieldsUp 3 minutes later with nothing changed...
Anyway, no settings I change in Sharing on the Mac affect these reports, it would appear that the Router is the one answering, not the Mac unless Ports are Forwarded.

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