Connection reset by peer

filebeat now emits the following error

2021-08-17T06:00:10.472+0900    ERROR   [logstash]      logstash/async.go:280   Failed to publish events caused by: write tcp XXX.XXX.XXX.XXX:XXX->XXX.XXX.XXX.XXX:XXX: write: connection reset by peer
2021-08-17T06:00:12.236+0900    ERROR   [publisher_pipeline_output]     pipeline/output.go:180  failed to publish events: write tcp XXX.XXX.XXX.XXX:XXX->XXX.XXX.XXX.XXX:XXX: write: connection reset by peer

The logs sent from filebeat on another server are correctly received by the server running logstash.

The server on the receiving end is using iptables to accept the IP of the server in question, so I don't think it's a firewall issue either.

What other possible causes can you think of?

Any advice is welcome.

Can someone please answer this question for me?
There are a few similar cases on this site, but no clear way to handle them is described.
Solving that error is a conundrum for me.

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