When I type "ipchains -L" I get a message: Ipchains: Incompatible with this kernel I am running YDL 2.1 with kernel 2.4.10-12a. I installed the ipchains rpm at install time. ipchains-1.3.9-17a is installed on my box. It appears that they did not get compiled into the kernel or there is some other problem. Any ideas for me? David