IPCHAINS again (because first mail was digital signed)

Hi list, I'am trying to set up an firewall with IPCHAINS. If the IPCHAINS-Script is not started, i kann do everything. (i use the same script on an other maschine and it works very fine and i want to change the maschines) But now wenn i start the script, the rules are loaded, but i cannot ping to the outside here the error messages ping wrote xxx.xxx.xxx.xxx 64 chars, ret=-1 ping sendto :Operating is not permitted ip-forwarding is enabled. Has anyone an idea. I'm going sick about this regards, Stephan Gerling