I have a CentOS 5.1 box which I have custom compiled iptables and a kernel on. The version I am using are iptables 1.4.0, kernel 2.6.25.4, and tproxy (specifically: tproxy-iptables-1.4.0-20080521-113954-1211362794.patch, and tproxy-kernel-2.6.25-20080519-165031-1211208631.tar.bz2 ) The problem I am having is that when I issue an iptables command to create a TPROXY rule, itpables errors saying that it can't initialize the TPROXY table. Normal I would assume that I had problems with the patches, compiling, etc. Everything patched cleanly, compiled fine, and installed fine. When I searched, I see the compiled libxt_TPROXY and xt_TPROXY.ko files in iptables build directory and the kernel modules directory. Isnmod xt_TROXY does not work. I must have done something wrong somewhere, can someone offer so suggestions? Nick