On Monday 03 January 2005 07:52, Eric Niebler wrote:
I've been running RedHat/Fedora since RH6.2, and I've *never* seen a problem like this. I just clean-installed Fedora Core 3, and HTTP is not working. I can ping websites, but I can't get to them via HTTP. I can FTP just fine. And the strangest thing is, once in a blue moon, I can actually get through (slooowly) to a website via HTTP, so it's only /mostly/ broken. ??!!
This machine dual-boots with WinXP, and when it's running XP, it has no problem getting to the internet via HTTP. So it's not the cables/router/DSL modem or my ISP. Is this some strange overeager firewall thing? How do I even begin diagnosing this problem?
I think you'll find it is an issue to do with later kernels and default settings for either ECN or TCP Window Scaling having changed. Normally this is fine, but some people have a broken router between them and where they are going.
If either
echo 0 > /proc/sys/net/ipv4/tcp_window_scaling
or
echo 0 > /proc/sys/net/ipv4/tcp_ecn
effect a magical cure then that was your problem: if so stick the cure in /etc/rc.local and away you go.
I'm sorry to report that this did not fix my problem. Setting tcp_window_scaling to 0 had no effect, and tcp_ecn was already 0.
I also tried stopping and restarting the network service after making the change, just to be sure. No luck.
Any other ideas?
Eric
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