If you use fwbuilder to compile and install your firewall rules you may have come accross
"sudo: sorry, you must have a tty to run sudo"

This is caused by a setting in the /etc/sudoers file "Defaults requiretty"

As root run
visudo
and comment out that line with a hash symbol
# Defaults requiretty

This is posted here for my benefit and future reference only. I am not sure of what security implications making this change would have. I take no responsibility for anyone toasting their box or getting hacked as a result of this information. If in doubt don't change the setting.

FWBuilder 2.1.16 on Windows
CentOS 5.x