The syslog file is being flooded with theses entries although port 1099 is listening:
May 25 15:33:26 metasfresh metasfresh-webui-api.jar[520]: 2017-05-25 15:33:26.235 WARN 594 [ ][ ] — [ JMX connector] o.a.a.broker.jmx.ManagementContext : Failed to start JMX connector Cannot bind to URL [rmi://localhost:1099/jmxrmi]: javax.naming.NameAlreadyBoundException: jmxrmi [Root exception is java.rmi.AlreadyBoundException: jmxrmi]. Will restart management to re-create JMX connector, trying to remedy this issue.