Jeremy Harris <[email protected]> (Do 26 Jan 2017 20:21:13 CET): > On 26/01/17 18:45, Thomas Hager wrote: > > While binding its listen ports, Exim tries to set TCP_FASTOPEN via > > setsockopt() on the sockets the daemon created. All of these calls fail > > with ENOPROTOOPT. > > Aha, right. You're running on too old a kernel, and I can use that > result (from the setsockopt) in children of the daemon to condition > use of sendto() (TFO active connections) for auxilary connections > (such as to rspamd). I should probably override transport configuration > of hosts_try_fastopen too.
Too old kernel? He wrote, that he's using Debian jessie, the same I use on my MX (where we yesterday played with that TFO). Linux mx 3.16.0-4-amd64 #1 SMP Debian 3.16.36-1+deb8u2 (2016-10-19) x86_64 GNU/Linux -- Heiko
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