The port that Grid usually uses is 4889. Are you installing and then upgrading from the old 10gr5? if so, that might be the problem. The old grid is using it? Lyall -----Original Message----- From: Andrew Kerber <andrew.kerber@xxxxxxxxx> To: ORACLE-L <oracle-l@xxxxxxxxxxxxx> Sent: Mon, Jul 26, 2010 2:36 pm Subject: OEM 11g grid installation problem - omsca I am attempting the installation of oem 11gr1. In the configuration assistant portion, the OMSCA is failing with this error. It looks like it is complaining about a port being in use, but I cant tell which one. Any ideas? OEL 64 bit 5.5, Weblogic 10.3.2 Java 1.6.: FINE: MDS Schema is there Jul 26, 2010 1:26:17 PM oracle.sysman.omsca.util.CoreOMSConfigAssistantUtil checkPort SEVERE: Exception: java.net.BindException: Address already in use at java.net.PlainSocketImpl.socketBind(Native Method) at java.net.AbstractPlainSocketImpl.bind(AbstractPlainSocketImpl.java:336) at java.net.ServerSocket.bind(ServerSocket.java:336) at java.net.ServerSocket.<init>(ServerSocket.java:202) at oracle.sysman.omsca.util.CoreOMSConfigAssistantUtil.checkPort(CoreOMSConfigAssistantUtil.java:2251) at oracle.sysman.omsca.adapter.wls.OMSWLSAdapterUtil.checkNodeMgrPort(OMSWLSAdapterUtil.java:656) at oracle.sysman.omsca.adapter.wls.OMSWLSAdapter.adapterPreReq(OMSWLSAdapter.java:1173) at oracle.sysman.omsca.framework.OMSGenericAdapter.doPreRequisiteChecks(OMSGenericAdapter.java:264) at oracle.sysman.omsca.framework.OMSCAFreshInstall.execute(OMSCAFreshInstall.java:90) at oracle.sysman.omsca.framework.OMSConfigAssistantDriver.main(OMSConfigAssistantDriver.java:210) Jul 26, 2010 1:26:17 PM oracle.sysman.omsca.adapter.wls.OMSWLSAdapter adapterPreReq FINE: OMSWLSAdapter::Failed to validate node manager port Jul 26, 2010 1:26:17 PM oracle.sysman.omsca.framework.OMSCAFreshInstall execute SEVERE: ERROR: Pre req checks of EM failed. Jul 26, 2010 1:26:17 PM oracle.sysman.omsca.framework.OMSConfigAssistantDriver main FINE: Got resultfalse -- Andrew W. Kerber 'If at first you dont succeed, dont take up skydiving.'