Thx for the reply.
This is in the log-File:
2016-11-22 18:20:08,854 INFO  [ API.main ]
2016-11-22 18:20:08,855 INFO  [Login.login]
2016-11-22 18:20:08,856 INFO  [Login.ReadAccount]
2016-11-22 18:20:08,863 INFO  [login.login_back]
2016-11-22 18:20:08,865 DEBUG  PORT found = 5000
2016-11-22 18:20:09,333 DEBUG  Output from POST request :{
   “SynoToken” : “q8lKgCHh7tJx2”,
   “result” : “success”,
   “success” : true
}
2016-11-22 18:20:09,335 INFO  [AudioStation.listPlayersRaw]
2016-11-22 18:20:09,338 DEBUG  POST data = api=SYNO.AudioStation.RemotePlayer&version=1&method=list
2016-11-22 18:20:09,351 ERROR  HTTP status = 405