http://jira.hyperic.com/browse/HHQ-4490
Try configuring vCenter Server under a 4.4 or 4.5 Agent running against a 4.5.1 HQ Server. It gives following error in agent log. vSphere-plugin.jar is present under both server and agent. Plugin deployed fine under both server and agent.
2010-11-30 19:11:40,067 ERROR [Thread-1] [RuntimeAutodiscoverer] Unexpected error running autodiscoverer for plugin: VMware vCenter: url not configured
org.hyperic.hq.product.PluginException: url not configured
at org.hyperic.hq.plugin.vsphere.VSphereUtil.getInstance(VSphereUtil.java:86)
at org.hyperic.hq.plugin.vsphere.VCenterDetector.discoverPlatforms(VCenterDetector.java:105)
at org.hyperic.hq.plugin.vsphere.VCenterDetector.discoverServices(VCenterDetector.java:163)
at org.hyperic.hq.product.ServerDetector.discoverResources(ServerDetector.java:219)
at org.hyperic.hq.autoinventory.agent.server.RuntimeAutodiscoverer.doRuntimeScan_internal(RuntimeAutodiscoverer.java:272)
at org.hyperic.hq.autoinventory.agent.server.RuntimeAutodiscoverer.doRuntimeScan(RuntimeAutodiscoverer.java:205)
at org.hyperic.hq.autoinventory.ScanManager.mainRunLoop(ScanManager.java:165)
at org.hyperic.hq.autoinventory.ScanManager.access$000(ScanManager.java:41)
at org.hyperic.hq.autoinventory.ScanManager$1.run(ScanManager.java:107)
Anonymous