HTTP not working
Andy Green
fedora at warmcat.com
Mon Jan 3 08:40:25 UTC 2005
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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.
- -Andy
- --
http://www.addintelligence.co.uk -- we design custom hardware and software for
your products
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