Hello.
I was annoyed by the subject message and decided to dig it a little. The
message appears sporadically and caused my application accept(2) error.
I've quickly discovered it's not a listen queue overflow. I've increased
kern.ipc.somaxconn to 1024 and listen(2) backlog argument too (netstat
-Lan output: tcp4 0/0/1024 *.8542). But without a success. (My
application serves only 3-5 connection simultaneously). Moreover, listen
queue overflows counter (netstat -s) was not increased.
I've decided it's a syncache or syncookie problem. First, I've set
net.inet.tcp.syncookies_only=1. But it does not help. Second, I've set
it back to 0 and set net.inet.tcp.syncookies=0. The messages gone.
A message I've wrote before (syncache_expand: Segment failed SYNCOOKIE
authentication, segment rejected (probably spoofed)) of course gone too.
May be somebody who familiar with syncookies can comment it?
--
Sem.
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