From Bugzilla Helper:
User-Agent: Mozilla/5.0 (Windows; U; Windows NT 5.1; en-US; rv:1.6)
Gecko/20040113

Description of problem:
Kernel has TCP ECN (Explicit Congestion Notification) enabled by
default, which some routers (notably the popular Netgear SOHO variety)
do not handle correctly, effectively breaking TCP connections accross
that router.

Version-Release number of selected component (if applicable):
kernel-2.6.1-1.65

How reproducible:
Always

Steps to Reproduce:
1.Fedora Core2 Test 1 behind Netgear WGR614 with latest firmware 1126
2.Attempt HTTP connection to external system
(http://fedora.redhat.com)    

Actual Results:  Ping + Traceroute + DNS to internet hosts OK
Timeouts in Mozilla, Konquerer, Lynx, and in raw telnet to port 80.
Manually disabling ECN as below restores functionality until reboot:
echo "0" > /proc/sys/net/ipv4/tcp_ecn



Expected Results:  Mozilla, Konquerer, and Lynx should be able to
access http://fedora.redhat.com

Additional info:

Workaround to disable ECN using command:
echo "0" > /proc/sys/net/ipv4/tcp_ecn