Re: Problem with sendmail 8.13.7

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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


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