[Bug 209471] Listen queue overflow due to too many sockets stuck in CLOSED state

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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=209471

--- Comment #9 from Robert Blayzor <rblayzor at inoc.net> ---
When I notice this problem happen, almost all of the connections stuck in
"CLOSED" seem to be 95-99% from the F5 load balancer doing a TCP health check.
All of the traffic between the servers and the F5 use IPv6 addresses.

I did notice this time when two Apache 2.4 servers croaked with this problem
that IPv4 connections were stalled out as well...


I just tried adding two sysctl knobs:

net.inet.tcp.drop_synfin=1
net.inet.tcp.nolocaltimewait=1



Probably will do nothing, but need to try something at this point..

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