client(43769): connect error - {tcp_closed,#Port<0.99717>} client(43769): EXIT for {shutdown,tcp_closed}

[AdityaYadav29]

I have 3 node deployment of EMQX running in aws eks. I am running the emqtt-bench for load testing with
./emqtt_bench conn -h nlbIp -p 1883 -k 60000 -c 50000 -i 30.

I am getting the above error in emqtt-bench.

In the client machine. I have set the below
ulimit -n 200000
sudo sysctl -w net.ipv4.ip_local_port_range="1025 65534"
echo 1000000 > /proc/sys/fs/nr_open

[qzhuyan]

I guess the LB closed the conn because of idling as you only connect but no sub/pub ops and you also use a very large keep alive timer (60000s) prevents clients to send heartbeat to make the LB decide to keep the TCP alive.