JVB cannot listen on port 10001


I wanted to change JVB listening port from default value (10000) to 10001 by adding org.jitsi.videobridge.SINGLE_PORT_HARVESTER_PORT=10001 in sip-communicator.properties. But surprisingly it fails to bind.

I tried it on different deployments and I get the same result :
JVB 2019-05-21 09:56:00.551 INFOS: [30] org.ice4j.ice.harvest.SinglePortUdpHarvester.createHarvesters() Failed to create SinglePortUdpHarvester for address java.net.BindException: Address already in use (Bind failed)

It says Address already in use but I don’t have any other service listening on PORT 10001.
This happens with ports 10001,10002,10003 and 10004 only.

Hello Jitsi Team,
Is this a bug on the latest version of JVB ?