inetd visible on internet

[thomas]

Hi,

given the specialized security policies of Ubuntu, i.e no listening
daemons open to the world I wonder why all ports seem to be stealthed (=
invisible) but not 113 (marked by Shields Up! at www.grc.com as closed).

Since I prefer to stealth all ports I wonder how to do that with
Ubuntu!? Even closing this port directly in Firestarter doesn't work at
all!?
Hmm, did anyone find a solution for this ?

greetings

Thomas