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Unblock the agent in OEM 12 C  by performing an agent resync from the console I am using OEM 12 c. Today my EM page was showing that one of the agent in unreachable. So, first of all I tried to see the status of the agent and it showed me the agent is alright. [oracle@NODE4 bin]$ ./emctl status agent Oracle Enterprise Manager Cloud Control 12c Release 2 Copyright (c) 1996, 2012 Oracle Corporation.  All rights reserved. --------------------------------------------------------------- Agent Version     : 12.1.0.2.0 OMS Version       : (unknown) Protocol Version  : 12.1.0.1.0 Agent Home        : /home/dir/oemcc/agent_inst Agent Binaries    : /home/oracle/dir/core/12.1.0.2.0 Agent Process ID  : 5159 Parent Process ID : 5044 - - - - --------------------------------------------------------------- Agent is Running and Ready Then I tried to upload the agent and found the following error: [oracl...

  1. Before you deinstall a Management Agent, do the following:     a. Stop the Agent using command from Management Agent home:                 cd /u01/oemcc_latest/core/12.1.0.2.0/bin/                 $ emctl stop agent     b. Wait for the Management Agent to go to the unreachable state in the Cloud Control console.     c. It is mandatory to delete the Management Agent and their monitored targets using any of the following methods: Remove the Agent target manually from the console: 1. Login to 12C Cloud Control 2. Navigate to Setup => Manage Cloud Control => Agents 3. Go to the Home page of the Agent that you want to remove 4. Expand the drop-down menu near the " Agent " 5. Expand the " Target Setup " option 6. Select " Remove Target "   ...