Using NGINX-1.21.6 as TLS test-server with remote Apache-Benchmark(AB) test-client
Both Server and Client are on Ubuntu20.04
For >6 workers on NGINX and >16 concurrent sessions AB sessions (ab -n400 -c32 https://)
a couple of test-sessions are not closed and AB reports timeout for them.
TCPDUMP analizys discover the a TLS-Record is lost == Not Sent by NGINX (or NET-stack) towatd OpenSSL and out to NET-dev.

Anybody have seen same/similar?
Thanks