JobScheduler restart with xml command via HTTP doesn't work

Current Situation

• No problems on Windows
• When the restart command

  <modify_spooler cmd="terminate_and_restart"/>

  is called via startscript, JOC or a different http client such as curl then the JobScheduler answers immediately with <ok/> and is shutting down but not started again.

• No error is logged in the scheduler.log
• If the above command is called with the JobScheduler directly via TCP and its command line option -send-cmd then the following error is raised but the JobScheduler restarts.

  Error Z-JAVA-105  Java exception java.lang.RuntimeException: Plugin com.sos.scheduler.engine.plugins.newwebservice.NewWebServicePlugin cannot be prepared: java.lang.RuntimeException: Binding to TCP port /0.0.0.0:40411 failed. Port is possibly in use and not available. Switch on DEBUG-level logging for `akka.io.TcpListener` to log the cause. CommandFailed(Bind(Actor[akka://Engine/user/EngineWebServer-http-0.0.0.0:40411#33728034],/0.0.0.0:40411,100,List(),Some(ServerSettings(spray-can/1.3.4,false,1,Timeouts(1441 minutes,1 day,2 s..., method=CallVoidMethodA []
  

Desired Behavior

The JobScheduler restart command has to work for HTTP