[Users] Host stuck in unresponsive state

Hi, my all-in-one host is stuck in unresponsive state, no matter what I try. Found this error in my engine.log: 2013-08-31 23:53:59,325 ERROR [org.ovirt.engine.core.vdsbroker.vdsbroker.GetCapabilitiesVDSCommand] (DefaultQuartzScheduler_Worker-54) Command GetCapabilitiesVDS execution failed. Exception: VDSNetworkException: java.net.ConnectException: Connection refused This message starts to appear when I try to activate the host (from maintenance state). Any idea how to activate the host? Running oVirt 3.3 RC2 on Fedora 19, all-in-one Setup. Thanks - Frank