Why does the 2.4 kernel report Connection refused when connecting to sites which work fine with earlier kernels?
• (DW) The 2.4 kernel is designed to make your Internet Experience more pleasurable. One of the ways in which it does so is by implementing Explicit Congestion Notification – a new method defined in RFC 3168 for improving TCP performance in the presence of congestion by allowing routers to provide an early warning of traffic flow problems. Unfortunately, there are bugs in some firewall products which cause them to reject incoming packets with ECN enabled. If your own firewall is broken in this respect, you should check with your vendor for a fix. If the site to which you cannot connect is not under your control, then after you have contacted the administrator of the offending site to let them know about their problem, you can disable ECN in the 2.4 kernel either by disabling the CONFIG_INET_ECN option and recompiling the kernel, or by executing the following command as root: # echo 0 > /proc/sys/net/ipv4/tcp_ecn • (REG) Fixes are available from some router vendors, and have been since
