Exception during establishing a SSL connection:-This is not an HTTP port

Search Guard
1

We are continuously getting below error. Please let me know the reason for this error, and what is corrective action will help to get rid of this error.

Exception during establishing a SSL connection: HttpRequestOnTransportException[This is not an HTTP port]
All the services are running fine but in the logs, we are continuously getting the above error.
elasticsearch version -7.8.0

logs :
02T09:59:21.048Z",“logger”:“c.f.s.s.t.SearchGuardSSLNettyTransport”,“timezone”:“UTC”,“marker”:"[btel-belk-elasticsearch-master-0] ",“log”:{“message”:“Exception during establishing a SSL connection: HttpRequestOnTransportException[This is not an HTTP port]”}}org.elasticsearch.transport.TcpTransport$HttpRequestOnTransportException: This is not an HTTP port at org.elasticsearch.transport.TcpTransport.readHeaderBuffer(TcpTransport.java:720) ~[elasticsearch-7.8.0.jar:7.8.0] at org.elasticsearch.transport.TcpTransport.readMessageLength(TcpTransport.java:713) ~[elasticsearch-7.8.0.jar:7.8.0] at org.elasticsearch.transport.InboundDecoder.internalDecode(InboundDecoder.java:62) ~[elasticsearch-7.8.0.jar:7.8.0] at org.elasticsearch.transport.InboundDecoder.decode(InboundDecoder.java:53) ~[elasticsearch-7.8.0.jar:7.8.0] at org.elasticsearch.transport.InboundPipeline.doHandleBytes(InboundPipeline.java:101) ~[elasticsearch-7.8.0.jar:7.8.0] at org.elasticsearch.transport.InboundPipeline.handleBytes(InboundPipeline.java:82) ~[elasticsearch-7.8.0.jar:7.8.0] at org.elasticsearch.transport.netty4.Netty4MessageChannelHandler.channelRead(Netty4MessageChannelHandler.java:73) ~[transport-netty4-client-7.8.0.jar:7.8.0] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.handler.logging.LoggingHandler.channelRead(LoggingHandler.java:271) [netty-handler-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.49.Final.jar:4.1.49.Final] at

2

The error means that someone is trying to use HTTP while talking to a port that accepts HTTPS only. Check all your applications that talk to Elasticsearch. Probably someone did a typo, and an application is trying to talk to Elasticsearch 9300 instead of 9200.

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