Firefox not bring up pages

David Miller justdave at
Sun Oct 24 22:23:11 UTC 2004

Christopher Hicks wrote:
> I've had trouble looking at pages on with Firefox PR1. 
> I'm able to bring up the same pages through google cache without 
> difficulty so I suspect its a problem with moz' apache.  Can anyone 
> cross check me?

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.

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 


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

Dave Miller      Project Leader, Bugzilla Bug Tracking System   

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