Xavier Ambrosioni:
> Maybe it's my router which manages the internet connection and
> NAT the incoming connection to my server which breaks the window
> scaling?

We have een reports on this mailing list that some routers or
firewalls mis-handle TCP features such as window scaling and ECN.

Of course it is possible that the problem is not with your
nearest router, but elsewhere in the network.

> Any workaround?

Disable TCP window scaling in the kernel.

*BSD:  sysctl -w net.inet.tcp.rfc1323=0
LInux: sysctl -w net.ipv4.tcp_window_scaling=0

Append the corresponding name=value setting to /etc/sysctl.conf
to make this setting active on each reboot.

        Wietse

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