Stefan Kuhlemann schrieb:
even more strange - today around 10:00 o'clock the sendmail started to
work normal until 16:00 o'clock. (with nothing changed since sunday
22:00)
My feelings tell me that the reason might be some strange 'ill-broken'
firewall network stack or some weird netwok communication issues (like
the 'fun' with the ECN-flag some years ago)
I'm tomorrow 'on-site'......
Stefan
Try following kernel parameter change
sysctl -w net.ipv4.tcp_window_scaling=0
and see if that helps. TCP window scaling behaviour changed with kernel
2.6.17 to be again more aggressive[1]. Some other systems are just
broken in this regard.
Alexander
