Check if you have a file called /etc/init.d/firewall, if so, then you probably have a default firewall script runnning. Alternatively, run lsmod | grep iptable in a console, if you get output, then you are running a firewall. You can edit the above mentioned file (although this may vary from distribution to distribution.
If you do not have a firewall set up, use a tool like Firestarter to generate firewall rules.
__________________
Hardware - Celeron 266 MHz, 128MB RAM, Intel i740 8MB RAM
Software - Slackware Linux 10.1; Archlinux 0.7; Windows 98 SE
Humanware - GS/CS C++ L+++ w b+++ DI+ D+ e
|