OPC Error Message with Flexy Connection

Hello at all, i’m creating a new OPC connection with eWon Flexy but get faulted with this Message UaException: status=Bad_SecurityChecksFailed, message=certificate path validation failed
at.
org.eclipse.milo.opcua.stack.core.util.CertificateValidationUtil.verifyTrustChain(CertificateValidationUtil.java:205)
at
org.eclipse.milo.opcua.stack.core.security.DefaultCertificateValidator.verifyTrustChain(DefaultCertificateValidator.java:45)
at org.eclipse.milo.opcua.sdk.client.api.identity.UsernameProvider.getIdentityToken(UsernameProvider.java:168)
at org.eclipse.milo.opcua.sdk.client.session.SessionFsmFactory.activateSession(SessionFsmFactory.java:858)
at org.eclipse.milo.opcua.sdk.client.session.SessionFsmFactory.lambda$configureActivatingState$14(SessionFsmFactory.java:336)
at com.digitalpetri.strictmachine.dsl.ActionBuilder$PredicatedTransitionAction.execute(ActionBuilder.java:76)
at com.digitalpetri.strictmachine.StrictMachine$PollAndEvaluate.lambda$run$0(StrictMachine.java:207)
at java.base/java.util.ArrayList.forEach(Unknown Source)
at com.digitalpetri.strictmachine.StrictMachine$PollAndEvaluate.run(StrictMachine.java:198)
at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.base/java.lang.Thread.run(Unknown Source)
8.0.3 (b2019080717)
Azul Systems, Inc. 11.0.3

Can You Help me?
Thanks

It sounds like you need to mark the eWon server certificate as trusted in the Config > OPC UA > Security section, on the “Client” tab.