HTTP not working

[Eric Niebler]

Andy Green wrote:
> 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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