The auto-discovery of endpoints should be excluding the host “host.docker.internal” automatically, which it doesn’t.
@Prosys this is a feauture request to you guys.

Apparently the Servers tries to bind to the same port twice which let’s the whole start fail.

08/10/2022 10:59:00.661 ERROR [SimulationServer] com.prosysopc.ua.app.simserver.i [] – Could not start the application.
java.lang.IllegalStateException: Expected the service f [FAILED] to be RUNNING, but the service has FAILED
at com.google.common.util.concurrent.AbstractService.checkCurrentState(AbstractService.java:379) ~[guava-29.0-jre.jar:?]
at com.google.common.util.concurrent.AbstractService.awaitRunning(AbstractService.java:303) ~[guava-29.0-jre.jar:?]
at com.google.common.util.concurrent.AbstractIdleService.awaitRunning(AbstractIdleService.java:164) ~[guava-29.0-jre.jar:?]
at com.prosysopc.ua.app.simserver.i.b(SourceFile:94) ~[app-5.2.2-9.jar:5.2.2-9]
at com.prosysopc.ua.app.simserver.SimulationServer.main(SourceFile:32) ~[app-5.2.2-9.jar:5.2.2-9]
at com.prosysopc.ua.app.Main.main(Main.java:13) ~[prosys-opc-ua-simulation-server-5.2.2-9.jar:5.2.2-9]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke0(Native Method) ~[?:?]
at jdk.internal.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) ~[?:?]
at jdk.internal.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) ~[?:?]
at java.lang.reflect.Method.invoke(Method.java:566) ~[?:?]
at com.exe4j.runtime.LauncherEngine.launch(LauncherEngine.java:84) ~[i4jruntime.jar:?]
at com.exe4j.runtime.WinLauncher.main(WinLauncher.java:94) ~[i4jruntime.jar:?]
at com.install4j.runtime.launcher.WinLauncher.main(WinLauncher.java:25) ~[i4jruntime.jar:?]
Caused by: java.lang.IllegalStateException: Expected to be healthy after starting. The following services are not running: {FAILED=[b [FAILED]]}
at com.google.common.util.concurrent.ServiceManager$ServiceManagerState.checkHealthy(ServiceManager.java:782) ~[guava-29.0-jre.jar:?]
at com.google.common.util.concurrent.ServiceManager$ServiceManagerState.awaitHealthy(ServiceManager.java:594) ~[guava-29.0-jre.jar:?]
at com.google.common.util.concurrent.ServiceManager.awaitHealthy(ServiceManager.java:322) ~[guava-29.0-jre.jar:?]
at com.prosysopc.ua.app.simserver.services.f.startUp(SourceFile:77) ~[app-5.2.2-9.jar:5.2.2-9]
at com.google.common.util.concurrent.AbstractIdleService$DelegateService$1.run(AbstractIdleService.java:61) ~[guava-29.0-jre.jar:?]
at com.google.common.util.concurrent.Callables$4.run(Callables.java:119) ~[guava-29.0-jre.jar:?]
at java.lang.Thread.run(Thread.java:834) ~[?:?]
Suppressed: com.google.common.util.concurrent.ServiceManager$FailedService: b [FAILED]
Caused by: com.prosysopc.ua.server.ar: Failed to initialize server endpoint: opc.tcp://host.docker.internal:53530/OPCUA/SimulationServer
at com.prosysopc.ua.server.aq.cq(SourceFile:2239) ~[app-5.2.2-9.jar:5.2.2-9]
at com.prosysopc.ua.server.aq.AO(SourceFile:2254) ~[app-5.2.2-9.jar:5.2.2-9]
at com.prosysopc.ua.server.aq.start(SourceFile:2115) ~[app-5.2.2-9.jar:5.2.2-9]
at com.prosysopc.ua.app.simserver.server.d.start(SourceFile:186) ~[app-5.2.2-9.jar:5.2.2-9]
at com.prosysopc.ua.app.simserver.server.d$b.startUp(SourceFile:96) ~[app-5.2.2-9.jar:5.2.2-9]
at com.google.common.util.concurrent.AbstractIdleService$DelegateService$1.run(AbstractIdleService.java:61) ~[guava-29.0-jre.jar:?]
at com.google.common.util.concurrent.Callables$4.run(Callables.java:119) ~[guava-29.0-jre.jar:?]
at java.lang.Thread.run(Thread.java:834) ~[?:?]

Deleting serverSettings.xml would not help.
It got generated with.

I tried
false
and it would not help.
I tried

127.0.0.1

and it would not help.

I tried

localhost

and it would not help.

I tried pausing Docker Desktop and it would not help.
I tried quitting Docker Desktop and it would not help.
(always the exception with trying to bind to host.docker.internal)

I noticed this section in my hosts file:
# Added by Docker Desktop
10.254.81.31 host.docker.internal
10.254.81.31 gateway.docker.internal
# To allow the same kube context to work on the host and the container:
127.0.0.1 kubernetes.docker.internal

commenting these out, I still get
ERROR: Failed to initialize server endpoint: opc.tcp://:53530/OPCUA/SimulationServer

I gues workaround should be limiting the auto-discovery, but I don’t know how to configure it properly. Please advise.

I am willing to set up a Remote Call, feel free to get in touch with me.
I also have some code I could borrow, that I use for my own OPC UA Server (stuff in conjunction with NetworkInterface.getNetworkInterfaces()).