cannot load some websites within m0n0wall

From:	"Ervin Malicdem" <schadow1 at gmail dot com>
To:	m0n0wall <m0n0wall at lists dot m0n0 dot ch>
Subject:	cannot load some websites within m0n0wall
Date:	Sun, 3 Sep 2006 06:25:11 +0800

I am having a problem of not being able to load some website through
computers behind m0n0wall.

For example, I can ping m0n0.ch within m0n0wall's ping utility but I cannot
ping m0n0.ch from any computers behind my LAN and OPT interface.

Although, this is only a problem to some sites and not all. One of them is
m0n0.ch.

What seems to be the problem?

Thank for any help.