# X509 certificate signed by unknown authority - received "bad\_certificate"
**URL:** https://discuss.elastic.co/t/x509-certificate-signed-by-unknown-authority-received-bad-certificate/319939
**Category:** Beats
**Tags:** elastic-stack-monitoring, beats-module, metricbeat
**Created:** [November 28, 2022, 11:11am UTC](https://discuss.elastic.co/t/x509-certificate-signed-by-unknown-authority-received-bad-certificate/319939 "2022-11-28T11:11:45Z")
**Posts on this page:** 2
**Page:** 1
### Author:  [@grumo35](https://discuss.elastic.co/u/grumo35)
#### Post date: [November 28, 2022, 11:11am UTC](https://discuss.elastic.co/t/x509-certificate-signed-by-unknown-authority-received-bad-certificate/319939/1 "2022-11-28T11:11:45Z")
Hi,
I came across some erros with metricbeat and the elasticsearch-xpack module.
Here is the error i get from metricbeat :
`Nov 28 12:03:27 S0CO000ELS04 metricbeat[4636]: 2022-11-28T12:03:27.827+0100#011ERROR#011module/wrapper.go:259#011 Error fetching data for metricset elasticsearch.enrich: error determining if connected Elasticsearch node is master: error making http request: Get "https://S0CO000ELS04.entity.com:9200/_nodes/_local/nodes": x509: certificate signed by unknown authority (possibly because of "crypto/rsa: verification error" while trying to verify candidate authority certificate "Entity Signing CA")`
And in the cluster logs :
```auto
eAddress=/172.20.50.64:44188}
io.netty.handler.codec.DecoderException: javax.net.ssl.SSLHandshakeException: Received fatal alert: bad_certificate
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:477) ~[netty-codec-4.1.66.Final.jar:4.1.66.Final]
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:276) ~[netty-codec-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:357) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:379) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:365) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:719) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeysPlain(NioEventLoop.java:620) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:583) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:493) [netty-transport-4.1.66.Final.jar:4.1.66.Final]
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:986) [netty-common-4.1.66.Final.jar:4.1.66.Final]
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74) [netty-common-4.1.66.Final.jar:4.1.66.Final]
at java.lang.Thread.run(Thread.java:1589) [?:?]
Caused by: javax.net.ssl.SSLHandshakeException: Received fatal alert: bad_certificate
at sun.security.ssl.Alert.createSSLException(Alert.java:130) ~[?:?]
at sun.security.ssl.Alert.createSSLException(Alert.java:117) ~[?:?]
at sun.security.ssl.TransportContext.fatal(TransportContext.java:358) ~[?:?]
at sun.security.ssl.Alert$AlertConsumer.consume(Alert.java:286) ~[?:?]
at sun.security.ssl.TransportContext.dispatch(TransportContext.java:204) ~[?:?]
at sun.security.ssl.SSLTransport.decode(SSLTransport.java:172) ~[?:?]
at sun.security.ssl.SSLEngineImpl.decode(SSLEngineImpl.java:736) ~[?:?]
at sun.security.ssl.SSLEngineImpl.readRecord(SSLEngineImpl.java:691) ~[?:?]
at sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:506) ~[?:?]
at sun.security.ssl.SSLEngineImpl.unwrap(SSLEngineImpl.java:482) ~[?:?]
at javax.net.ssl.SSLEngine.unwrap(SSLEngine.java:679) ~[?:?]
at io.netty.handler.ssl.SslHandler$SslEngineType$3.unwrap(SslHandler.java:298) ~[netty-handler-4.1.66.Final.jar:4.1.66.Final]
at io.netty.handler.ssl.SslHandler.unwrap(SslHandler.java:1344) ~[netty-handler-4.1.66.Final.jar:4.1.66.Final]
at io.netty.handler.ssl.SslHandler.decodeJdkCompatible(SslHandler.java:1237) ~[netty-handler-4.1.66.Final.jar:4.1.66.Final]
at io.netty.handler.ssl.SslHandler.decode(SslHandler.java:1286) ~[netty-handler-4.1.66.Final.jar:4.1.66.Final]
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:507) ~[netty-codec-4.1.66.Final.jar:4.1.66.Final]
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:446) ~[netty-codec-4.1.66.Final.jar:4.1.66.Final]
```
Looks like a bad certificate or a CA issue so i tried to verify that the cert is issued by :
```auto
root@S0CO000ELS04: openssl verify -verbose -CAfile /etc/elasticsearch/certs/entity-ca.crt /etc/elasticsearch/certs/S0CO000ELS04.entity.com.crt
/etc/elasticsearch/certs/S0CO000ELS04.entity.com.crt: OK
```
Here is my metricbeat config :
```auto
output.elasticsearch:
hosts: ["array"]
# Protocol - either `http` (default) or `https`.
protocol: "https"
# Authentication credentials - either API key or username/password.
#api_key: "id:api_key"
username: "metricbeat"
password: ""
ssl.verification: none # Even with this SSL errors still persits
output.elasticsearch.ssl.certificate_authorities: ["/etc/elasticsearch/certs/Entity-ca.crt"]
```
The module :
```auto
- module: elasticsearch
xpack.enabled: true
period: 10s
hosts: ["https://S0CO000ELS04.entity.com:9200"]
username: "metricbeat"
password: ""
ssl.enabled: true
ssl.certificate_authorithies: ["/etc/elasticsearch/certs/Entity-ca.crt"]
ssl.verification: none
```
There is something i'm missing about this error and the configuration ?
I dont know why it's unknown certificate authority for the same certificate used by my cluster
---
### Author:  [@system](https://discuss.elastic.co/u/system)
#### Post date: [December 26, 2022, 11:12am UTC](https://discuss.elastic.co/t/x509-certificate-signed-by-unknown-authority-received-bad-certificate/319939/2 "2022-12-26T11:12:28Z")
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