Can't access local Computer

From: keven (kdenton_at_xpsystems.com)
Date: 07/31/03 

Date: Wed, 30 Jul 2003 20:34:48 -0700

Hello I can access the internet, and ping things on the
internet. I can ping this machine from another
computer. I can't ping another computer from this
machine. What am I doing wrong?

Thanks Keven