Hi,

For understanding better the OPC Specification, I’m trying to connect with your Prosys OPC UA Client (Version: 2.2.2) to the Server-Example of the Eclipse Milo Project (https://github.com/eclipse/milo/blob/master/milo-examples/server-examples/src/main/java/org/eclipse/milo/examples/server/ExampleServer.java).

So I’m starting the Server from the main class of the ExampleServer.java in my Eclipse (Neon.3 Release (4.6.3)). Default server successfully created at:

opc.tcp://127.0.0.1:12686/example

Now I use the client to connect to Server, with Security Mode: none. In the Eclipse Console an exception is visible:

[ua-netty-event-loop-3] ERROR org.eclipse.milo.opcua.stack.server.handlers.UaTcpServerHelloHandler – [remote=/127.0.0.1:63382] Exception caught; sent ErrorMessage{error=StatusCode{name=Bad_TcpEndpointUrlInvalid, value=0x80830000, quality=bad}, reason=unrecognized endpoint url: }
io.netty.handler.codec.DecoderException: UaException: status=Bad_TcpEndpointUrlInvalid, message=unrecognized endpoint url:
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:418)
at io.netty.handler.codec.ByteToMessageDecoder.channelRead(ByteToMessageDecoder.java:245)
at io.netty.channel.AbstractChannelHandlerContext.invokeChannelRead(AbstractChannelHandlerContext.java:292)
at io.netty.channel.AbstractChannelHandlerContext.fireChannelRead(AbstractChannelHandlerContext.java:278)
at io.netty.channel.DefaultChannelPipeline.fireChannelRead(DefaultChannelPipeline.java:962)
at io.netty.channel.nio.AbstractNioByteChannel$NioByteUnsafe.read(AbstractNioByteChannel.java:131)
at io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:528)
at io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:485)
at io.netty.channel.nio.NioEventLoop.processSelectedKeys(NioEventLoop.java:399)
at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:371)
at io.netty.util.concurrent.SingleThreadEventExecutor$2.run(SingleThreadEventExecutor.java:112)
at java.lang.Thread.run(Thread.java:748)
Caused by: UaException: status=Bad_TcpEndpointUrlInvalid, message=unrecognized endpoint url:
at org.eclipse.milo.opcua.stack.server.handlers.UaTcpServerHelloHandler.lambda$onHello$0(UaTcpServerHelloHandler.java:86)
at java.util.Optional.orElseThrow(Optional.java:290)
at org.eclipse.milo.opcua.stack.server.handlers.UaTcpServerHelloHandler.onHello(UaTcpServerHelloHandler.java:83)
at org.eclipse.milo.opcua.stack.server.handlers.UaTcpServerHelloHandler.decode(UaTcpServerHelloHandler.java:68)
at io.netty.handler.codec.ByteToMessageDecoder.callDecode(ByteToMessageDecoder.java:387)
… 11 more

The client come up with a message:

Could not connect to server:
Error=Failed to retrieve endpoints. The server is not available: opc.tcp://127.0.0.1:12686/example

At the startup of the server an endpoint of the given url is successfully created.

Any idea?

Vice versa: with the Client Example of the Milo-Project I can succesfully connect to the ProSys Simulation Server.