Self Hosted WebApi Accessible ony in Localhost (not over LAN=

Hi all

I have created a self hosted webapi (appBuilder) that runs in a Windows Service.
If I call the api from windows testclient or from fiddler from localhost, it runs fine.
The service runs under my domainaccount .

The service has to be accessible over the LAN:
Therefore  I have called the command:
netsh http add urlacl url=http://+:2345/ user=<domain>\<my domainaccount> delegate=yes
 
Problem:
- After I have called the command, the service is not accessible over my IP and also no more from localhost.
- If I delete the reservation (with netsh delete) the service is accessible again from localhost

Base-Address: http://127.0.0.1:2345/
Code in startup.vb:
Dim config As New HttpConfiguration()
config.MapHttpAttributeRoutes()
config.Routes.MapHttpRoute(name:="DefaultApi", routeTemplate:="api/{controller}/{id}", defaults:=New With {Key .id = RouteParameter.[Optional]})
appBuilder.UseWebApi(config)

Code in OnStart:
  _server = WebApp.Start(Of Startup)(url:=baseAddress)

What do I have to do, to solve this problem?
Thanks