Linux 2.1.132 / stealth?

["Damon T. Miller" <dtm () harmonixmusic com>]

Hi all.  First off, thanks to Fyodor for the excellent tool that is Nmap;
it's superior to every other scanner I've used, and the recently-added OS
fingerprinting is great.  Nice work.

That said, I have a question regarding Stealth scanning on a Linux 2.1.132
box.  I've previously used Nmap with the stable kernels (2.0.x, up to 36)
and everything works.  However, after switching to the 2.1 series, it seems
that Stealth scanning always returns zero hosts up.  (nmap -sS x.x.x.x-x).
Has anyone else had a similar problem?

Thanks,

Damon