Firewall issues?

[Brian Densmore]

Ok, this is off-topic a bit, but it could possibly 
apply to Linux/FreeBSD too.

I have someone who is trying to connect to our FTP
server, but they are running a McAfee firewall.

They can get out on the internet. But they cannot
connect to the server and when they try pinging it,
they get unknown host errors. I seem to remember
having this problem on a firewall I set up in Linux,
but I can't seem to remember what part of a firewall
configuration would cause this.

Thanks,
Brian

Windows 95 - A 
32 bit extension to a 
16 bit shell for a
 8 bit operating system designed for
 4 bit computers by a
 2 bit company that can't stand
 1 bit of competition.