After much trial and error I determined the cause of this problem: TCP Explicit Congestion Notification support is built into the stock Mandrake 8.1 kernel and is not turned off at boot time. Obviously, the root of the problem is walgreens, etc. having bad routers (not sure why my print server was refusing the connection as well) but Mandrake either needs to disable this in their kernels or provide an init script that does:
echo 0 > /proc/sys/net/ipv4/tcp_ecn Very, very nasty problem to track down. On 31-Oct-2001 Jason Bodnar wrote: > I upgraded to 8.1 the other day and now I can't connect to certain hosts such > as walgreens.com, matrix.net, puc.state.tx.us or the web admin interface of > my > Intel printserver. > > Simply trying to telnet to any of these hosts results in a connection > refused: > > $ telnet www.walgreens.com 80 > Trying 63.73.199.22... > telnet: Unable to connect to remote host: Connection refused > > $ telnet pucsmtp.puc.state.tx.us 25 > Trying 168.39.76.245... > telnet: Unable to connect to remote host: Connection refused > > $ telnet 192.168.1.5 80 > Trying 192.168.1.5... > telnet: Unable to connect to remote host: Connection refused > > > A windows machine and a Mandrak 8.0 box on my internal network can get to > these > hosts just fine. > > The only table configured is nat: > > $ sudo iptables -t nat -L > Chain PREROUTING (policy ACCEPT) > target prot opt source destination > > Chain POSTROUTING (policy ACCEPT) > target prot opt source destination > MASQUERADE all -- anywhere anywhere > > Chain OUTPUT (policy ACCEPT) > target prot opt source destination > > > The rest are empty: > > $ sudo iptables -t filter -L > Chain INPUT (policy ACCEPT) > target prot opt source destination > > Chain FORWARD (policy ACCEPT) > target prot opt source destination > > Chain OUTPUT (policy ACCEPT) > target prot opt source destination > > $ sudo iptables -t mangle -L > Chain PREROUTING (policy ACCEPT) > target prot opt source destination > > Chain OUTPUT (policy ACCEPT) > target prot opt source destination > > > Any ideas? > > -- > Jason Bodnar > [EMAIL PROTECTED] > -- Jason Bodnar [EMAIL PROTECTED]
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