Firefox not bring up pages

Christopher Hicks chicks at
Sun Oct 24 22:40:35 UTC 2004

On Sun, 24 Oct 2004, David Miller wrote:
> Nope, it's a problem with OpenBSD's pf implementation in OpenBSD 3.1. 
>'s web host is using OpenBSD 3.1 (plus security patches) as their 
> firewall, and the bug in their window scaling implementation was fixed in 
> OpenBSD 3.3.  Unfortunately, they didn't see fit to include it in the 
> security updates, so you actually have to upgrade the system to pick it up. 
> It'll get upgraded eventually, but because it's a whole OS upgrade it'll 
> probably be a month or two.

Is there a bug for this in bugzilla I can vote for?

> It only affects machines running Linux 2.6.8+ kernels on the client end 
> (which is why people are just now suddenly running into it).
> In the meantime, you can work around it by doing this as root:
> sysctl -w net.ipv4.tcp_default_win_scale=0
> To make it permanent, you can add the following to your /etc/sysctl.conf 
> file:
> net.ipv4.tcp_default_win_scale=0

I'd heard of this, but its the first time to bite me in the butt.  I guess 
I'll vnc into my Windows box to view  Ugh.

> The best writeup of the situation I've seen so far is at 
> if you're curious about the details. :)

Thanks for that.  LWN has the real dirt as usual.


Physics is like sex. Sure, it may give some practical results, but that's not
why we do it.         -- Richard Feynman

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