Hi @Kevin.Herron
I am trying to connect an machine to the Ignition Server using an OPC-UA card, but I am encountering the following error on the server side:
sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
I have tested the same scenario in a local environment by connecting the machine directly to a laptop, and the communication works successfully. That setup is not restricted by any network security policies.
However, when I attempt to connect the machine to the Ignition Server within the server/network environment, the connection fails with the above error.
Thank you.
What does the rest of the error / stack trace say? Click “Show Full Details”.
Most likely one side of the connecton needs to trust the other side.
1 Like
This the full details
UaException: status=Bad_SecurityChecksFailed, message=sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at org.eclipse.milo.opcua.stack.core.util.validation.CertificateValidationUtil.buildCertPath(CertificateValidationUtil.java:400)
at org.eclipse.milo.opcua.stack.core.util.validation.CertificateValidationUtil.buildTrustedCertPath(CertificateValidationUtil.java:120)
at org.eclipse.milo.opcua.stack.client.security.DefaultClientCertificateValidator.validateCertificateChain(DefaultClientCertificateValidator.java:64)
at org.eclipse.milo.opcua.stack.client.transport.uasc.UascClientMessageHandler.onOpenSecureChannel(UascClientMessageHandler.java:469)
at org.eclipse.milo.opcua.stack.client.transport.uasc.UascClientMessageHandler.decodeMessage(UascClientMessageHandler.java:394)
at org.eclipse.milo.opcua.stack.client.transport.uasc.UascClientMessageHandler.decode(UascClientMessageHandler.java:382)
at io.netty.handler.codec.ByteToMessageCodec$1.decode(ByteToMessageCodec.java:42)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:530)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:469)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290)
at io.netty.handler.codec.ByteToMessageCodec.channelRead(ByteToMessageCodec.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at org.eclipse.milo.opcua.stack.client.transport.uasc.UascClientAcknowledgeHandler.decode(UascClientAcknowledgeHandler.java:171)
at io.netty.handler.codec.ByteToMessageCodec$1.decode(ByteToMessageCodec.java:42)
at io.netty.handler.codec.ByteToMessageDecoder.decodeRemovalReentryProtection(ByteToMessageDecoder.java:530)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:469)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:290)
at io.netty.handler.codec.ByteToMessageCodec.channelRead(ByteToMessageCodec.java:103)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:442)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:412)
at io.netty.channel.DefaultChannelPipeline$HeadContext.channelRead(DefaultChannelPipeline.java:1410)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:440)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:420)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:919)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:166)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:788)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:724)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:650)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:562)
at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
at java.base/java.lang.Thread.run(Unknown Source)
Caused by: sun.security.provider.certpath.SunCertPathBuilderException: unable to find valid certification path to requested target
at java.base/sun.security.provider.certpath.SunCertPathBuilder.build(Unknown Source)
at java.base/sun.security.provider.certpath.SunCertPathBuilder.engineBuild(Unknown Source)
at java.base/java.security.cert.CertPathBuilder.build(Unknown Source)
at org.eclipse.milo.opcua.stack.core.util.validation.CertificateValidationUtil.buildCertPath(CertificateValidationUtil.java:398)
... 34 more
8.1.42 (b2024061810)
Azul Systems, Inc. 17.0.11
Go to the security area and make sure the server certificate is trusted.
If the server is using a certificate chain and not just a self-signed certificate, the root/CA cert must also be trusted.
