Hello List, Due to a problem with CentOS 5 and one of our firewalls I am having to disable tcp window scaling to stop network connections grinding to a halt. I am also trying to Kickstart CentOS 5 machines through the firewall so need to disable window scaling at install time. I have added to the kickstart file %pre echo 0 > /proc/sys/net/ipv4/tcp_window_scaling But the install still hangs while transferring the stage2.img Should the above %pre work or do I need to do something else to disable window scaling during the install. In case anyone's interested CentOS 5 is the first time we have suffered this problem both CentOS 3&4 worked without issue. Thanks Dean