failed (104: Connection reset by peer) while proxying connection

[Mauro Tridici]

Dear Users,

I’m noticing a these error messages in /var/log/nginx/error.log.

021/05/21 10:57:25 [error] 21145#0: *7 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321
2021/05/21 10:58:07 [error] 21145#0: *9 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321
2021/05/21 10:58:46 [error] 21145#0: *11 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321
2021/05/21 10:59:19 [error] 21145#0: *13 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321
2021/05/21 10:59:57 [error] 21145#0: *15 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321
2021/05/21 11:00:55 [error] 21145#0: *17 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321
2021/05/21 11:01:38 [error] 21145#0: *19 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321
2021/05/21 11:02:33 [error] 21145#0: *21 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321
2021/05/21 11:03:06 [error] 21145#0: *23 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321
2021/05/21 11:03:39 [error] 21145#0: *25 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321
2021/05/21 11:04:33 [error] 21145#0: *27 recv() failed (104: Connection reset by peer) while proxying connection, client: public_ip, server: 0.0.0.0:5044, upstream: "private_ip:5044", bytes from/to client:321/7709, bytes from/to upstream:7709/321

Basically, it seems that the error is related to a particular (authorized) IP address.
This remote FILEBEAT client is sending data to LOGSTASH server via NGINX.

Do you some suggestion to fix this annoying issue?

Thank you in advancee,
Mauro