I am using nodejs and ws to create a websocket server. The server runs behind a nginx proxy. I have written a c client using libwebsocket which connects to this client. This setup works well for couple of days but after that connection is reported closed on nodejs server but client still continues to receive pong for each ping it sends.

Nginx config is as followes

proxy-connect-timeout:120 proxy-read-timeout:3600 proxy_send_timeout:3600

in libwebsocket

ka_time : 10s; ka_probes: 3; ka_interval: 120s; ws_ping_pong_interval: 120s

Question 1) Does nginx send response to ping sent by client? Question 2) What can be the config to avoid this?