javax.net.ssl.SSLHandshakeException: Received fatal alert: bad_certificate

Hello,

Since I have enabled and made the configuration for x-pack security, the following message keeps appearing at my elasticsearch log:

javax.net.ssl.SSLHandshakeException: Received fatal alert: bad_certificate
	at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:468) ~[netty-codec-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) ~[netty-codec-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:355) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:377) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:363) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:163) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:714) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:615) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:578) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) [netty-transport-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:989) [netty-common-4.1.45.Final.jar:4.1.45.Final]
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.45.Final.jar:4.1.45.Final]
	at java.lang.Thread.run(Thread.java:832) [?:?]

Does anyone have any idea of what could be happening?

Thank you in advance.

I don't want to leave you hanging but that could be caused by numerous things along the way. Here is a thread that similar to this which might shed some light on what is gong on. Your best bet if you're still stuck after reading that thread is to post more information like that poster did to help try to pin point any flaws you might have in any configuration steps: