Can't connect to PLC over VPN

[JessevGool]

Describe the bug
I am unable to connect to a PLC that I am connected to over a VPN. I can connect to the PLC using different libraries just fine but Milo is throwing a timeout.
I am using the following code:

public class Main {
    public static void main(String[] args)  throws Exception{
        OpcUaClient client = OpcUaClient.create(
                "opc.tcp://192.168.30.5:4840",
                endpoints -> endpoints.stream().findFirst(),
                configBuilder -> configBuilder
                        .setRequestTimeout(UInteger.valueOf(10000))
                        .setConnectTimeout(UInteger.valueOf(10000))
                        .build()
        );
        try {
            client.connect().get();
        } catch (Exception e) {
            if (e.getCause() instanceof UaException) {
                UaException uaException = (UaException) e.getCause();
                System.out.println("Failed to connect. Status: " + uaException.getStatusCode());
                System.out.println("Error message: " + uaException.getMessage());
            }
            e.printStackTrace();
        }


        UaVariableNode node = client.getAddressSpace().getVariableNode(Identifiers.Server_ServerStatus_StartTime);
        DataValue value = node.readValue();

        System.out.printf("StartTime=%s", value.getValue().getValue().toString());
    }
}

Logs and Packet Captures
The error being thrown

[main] INFO org.eclipse.milo.opcua.sdk.client.OpcUaClient - Java version: 17.0.12
[main] INFO org.eclipse.milo.opcua.sdk.client.OpcUaClient - Eclipse Milo OPC UA Stack version: 0.6.13
[main] INFO org.eclipse.milo.opcua.sdk.client.OpcUaClient - Eclipse Milo OPC UA Client SDK version: 0.6.13
Failed to connect. Status: StatusCode{name=Bad_Timeout, value=0x800A0000, quality=bad}
Error message: io.netty.channel.ConnectTimeoutException: connection timed out after 10000 ms: /50.50.50.1:4840
java.util.concurrent.ExecutionException: UaException: status=Bad_Timeout, message=io.netty.channel.ConnectTimeoutException: connection timed out after 10000 ms: /50.50.50.1:4840
	at java.base/java.util.concurrent.CompletableFuture.reportGet(CompletableFuture.java:396)
	at java.base/java.util.concurrent.CompletableFuture.get(CompletableFuture.java:2073)
	at org.example.Main.main(Main.java:35)
Caused by: UaException: status=Bad_Timeout, message=io.netty.channel.ConnectTimeoutException: connection timed out after 10000 ms: /50.50.50.1:4840
	at org.eclipse.milo.opcua.stack.client.transport.uasc.ClientChannelFsm$ClientChannelActions.lambda$connect$0(ClientChannelFsm.java:126)
	at io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:590)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:583)
	at io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:559)
	at io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:492)
	at io.netty.util.concurrent.DefaultPromise.setValue0(DefaultPromise.java:636)
	at io.netty.util.concurrent.DefaultPromise.setFailure0(DefaultPromise.java:629)
	at io.netty.util.concurrent.DefaultPromise.tryFailure(DefaultPromise.java:118)
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:264)
	at io.netty.util.concurrent.PromiseTask.runTask(PromiseTask.java:98)
	at io.netty.util.concurrent.ScheduledFutureTask.run(ScheduledFutureTask.java:153)
	at io.netty.util.concurrent.AbstractEventExecutor.runTask(AbstractEventExecutor.java:173)
	at io.netty.util.concurrent.AbstractEventExecutor.safeExecute(AbstractEventExecutor.java:166)
	at io.netty.util.concurrent.SingleThreadEventExecutor.runAllTasks(SingleThreadEventExecutor.java:470)
	at io.netty.channel.nio.NioEventLoop.run(NioEventLoop.java:569)
	at io.netty.util.concurrent.SingleThreadEventExecutor$4.run(SingleThreadEventExecutor.java:997)
	at io.netty.util.internal.ThreadExecutorMap$2.run(ThreadExecutorMap.java:74)
	at java.base/java.lang.Thread.run(Thread.java:840)
Caused by: io.netty.channel.ConnectTimeoutException: connection timed out after 10000 ms: /50.50.50.1:4840
	at io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe$1.run(AbstractNioChannel.java:263)
	... 9 more
Exception in thread "main" UaException: status=Bad_SessionClosed, message=The session was closed by the client.
	at org.eclipse.milo.opcua.sdk.client.session.SessionFsmFactory.lambda$null$1(SessionFsmFactory.java:164)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1136)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:635)
	at java.base/java.lang.Thread.run(Thread.java:840)

Additional context
I am using the latest version of Milo, the error doesn't occur when I try to connect to the public server. I also noted that it says 50.50.50.1:4840 in the error and I'm wondering where that is coming from

[kevinherron]

The server is either misconfigured or otherwise doesn't know about the "external" IP address you are using to reach it, so you have to update the endpoint URL in the EndpointDescription yourself.

See https://stackoverflow.com/questions/40554198/java-opc-ua-client-eclipse-milo-endpoint-url-changes-to-localhost/40555243#40555243

[JessevGool]

Thanks Kevin that worked!