Comment 11 for bug 59331

Had this problem as well, and this fix worked! Thank you!

In my case I was installing Hardy Heron Ubuntu 8.04 and was able to connect to my Speedtouch 716 v5 WL router okay with limited internet connectivity. My windows PC on the same network was working fine, but my Ubuntu PC was not able to see all internet sites, just some of them.

For newish Linux users here is a complete idiots guide:

The goal is to edit file /etc/sysctl.conf to add the line net.ipv4.tcp_window_scaling=0

1. Open a terminal window from APPLICATIONS -> ACCESSORIES -> TERMINAL

2. You must then edit it as a super user as it is a system file, so type:
sudo gedit /etc/sysctl.conf

3. Enter your password when asked

4. Anywhere in the file start a new line and type:
net.ipv4.tcp_window_scaling = 0

5. Save the file.

6. Close down Ubuntu as normal.

7. Restart your PC.

And all should be well. If it isn't then you probably have a different problem, but it may be worth checking the file /etc/sysctl.conf to make sure you made the change correctly. For example it you try to edit it but are not logged on as superuser then it will not have been changed.