JON cannot observe my EAP 6.x

I have installed JON 3.1.2 and JBoss EAP 6.1.1 and 6.2.0 and in the JON Inventory there is problem with doscovering JBoss resources:

No configuration was retrieved. This means that either the plugin failed to load the configuration or that configuration collection is merely switched off in the connection settings.

Failed to retrieve member Resource configurations for [ResourceGroup[id=10001, name=JBoss-02-JON.localdomain ( JBossAS7 Standalone Server ), category=COMPATIBLE, type=JBossAS7 Standalone Server, isDynaGroup=false, isClusterGroup=false]]

Another resources are discovered ok. Can somebody help me?