Some IPs on Internet can't access me server ?

From:	"Aleksandar Jovanovic" <jjoksa at gmail dot com>
To:	m0n0wall at lists dot m0n0 dot ch
Subject:	Some IPs on Internet can't access me server ?
Date:	Mon, 2 Oct 2006 14:58:15 +0200

I have server on address e.g. 80.93.200.15, everyone can access but
not from network 80.93.200.xxx ? M0n0wall block something, how to fix
this ?