I did a clean install and use Webmin/Virtualmin.
The server seemed a little slow and I eventually figured out it was a TCP window scaling issue. At the command line I get 0 if I do "sysctl net.ipv4.tcp_window_scaling".
So I edited /etc/sysctl.conf and added this line at the end:
If I do "/sbin/sysctl -p" it works. But...When I reboot, the setting is still 0 if I do "sysctl net.ipv4.tcp_window_scaling"!
How can I fix this setting so that it is permanent?