HTTP not working

[Andy Green]

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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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