[GelfTcpTransport] Channel disconnected!

Hi,

Keep receiving the channel disconnected log but can’t find what is the issue…
Error show in the log after upgrade graylog from 2.4.5 to 3.3.9.
All output are able to connect

OS: Centos 7
ES: 5.6.16
MongoDB: 3.4.24
3 graylog and 3 ES server.

2020-12-11T15:55:05.694Z ERROR [GelfMessageJsonEncoder] JSON encoding error
java.io.IOException: Connection reset by peer
at sun.nio.ch.FileDispatcherImpl.read0(Native Method) ~[?:1.8.0_272]
at sun.nio.ch.SocketDispatcher.read(SocketDispatcher.java:39) ~[?:1.8.0_272]
at sun.nio.ch.IOUtil.readIntoNativeBuffer(IOUtil.java:223) ~[?:1.8.0_272]
at sun.nio.ch.IOUtil.read(IOUtil.java:192) ~[?:1.8.0_272]
at sun.nio.ch.SocketChannelImpl.read(SocketChannelImpl.java:379) ~[?:1.8.0_272]
at io.netty.buffer.PooledByteBuf.setBytes(PooledByteBuf.java:253) ~[graylog.jar:?]
at io.netty.buffer.AbstractByteBuf.writeBytes(AbstractByteBuf.java:1133) ~[graylog.jar:?]
at io.netty.channel.socket.nio.NioSocketChannel.doReadBytes(NioSocketChannel.java:350) ~[graylog.jar:?]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:148) [graylog.jar:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) [graylog.jar:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:650) [graylog.jar:?]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:576) [graylog.jar:?]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) [graylog.jar:?]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) [graylog.jar:?]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [graylog.jar:?]
at io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30) [graylog.jar:?]
at java.lang.Thread.run(Thread.java:748) [?:1.8.0_272]
2020-12-11T15:55:05.695Z INFO [GelfTcpTransport] Channel disconnected!

Any suggestion? Thank you.

Any suggested direction that I can check?
Thank you!

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