How to fix Oracle EM error - Agent is blocked

1- Check the agent status using the following commands:

[em_user@BIH002 bin]$ ./emctl status agent

Oracle Enterprise Manager Cloud Control 12c Release 3
Copyright (c) 1996, 2013 Oracle Corporation.  All rights reserved.
---------------------------------------------------------------

Agent Version     : 12.1.0.3.0
OMS Version       : (unknown)
Protocol Version  : 12.1.0.1.0
Agent Home        : /em_agent12.3/agent_inst
Agent Binaries    : /em_agent12.3/core/12.1.0.3.0
Agent Process ID  : 64164
Parent Process ID : 64110
Agent URL         : https://bih002:3872/emd/main/
Repository URL    : https://dcg023:4900/empbs/upload
Started at        : 2013-11-13 15:26:08
Started by user   : em_user
Last Reload       : (none)
Last successful upload                       : (none)
Last attempted upload                        : 2013-11-13 15:26:14
Total Megabytes of XML files uploaded so far : 0
Number of XML files pending upload           : 72
Size of XML files pending upload(MB)         : 0.11
Available disk space on upload filesystem    : 91.16%
Collection Status                            : Collections enabled
Heartbeat Status                             : Agent is blocked
Blocked Reason    : Plugin mismatch found between agent and repository. Please perform an
 agent resync to unblock the agent. Mismatched plugins: [ The plug-in is oracle.sysman.ema
s
Last attempted heartbeat to OMS              : 2013-11-13 15:26:13
Last successful heartbeat to OMS             : (none)
Next scheduled heartbeat to OMS              : 2013-11-13 15:29:14

---------------------------------------------------------------

Agent is Running and Ready
We can see that we have an error "Plugin mismatch found between agent and repository". This is true as i have just applied an plugin to my Enterprise Manager repository. Download Full Free Installation Manual PDF Book from here:

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2- How to unblock the agent.

  • 2.1 - Using the EM12C(Enterprise Manager Interface) GUI follow the step bellow:

  • Main Page Agents
  • Select Unknown
  • Select the Agent
  • Agent Resynchronization
  • 3- Check the status of your agent now.
 [em_user@BIH002 bin]$ ./emctl status agent
Oracle Enterprise Manager Cloud Control 12c Release 3
Copyright (c) 1996, 2013 Oracle Corporation.  All rights reserved.
---------------------------------------------------------------

Agent Version     : 12.1.0.3.0
OMS Version       : 12.1.0.3.0
Protocol Version  : 12.1.0.1.0
Agent Home        : /em_agent12.3/agent_inst
Agent Binaries    : /em_agent12.3/core/12.1.0.3.0
Agent Process ID  : 1447
Parent Process ID : 1388
Agent URL         : https://bih002:3872/emd/main/
Repository URL    : https://dcg023:4900/empbs/upload
Started at        : 2013-11-13 15:30:25
Started by user   : em_user
Last Reload       : (none)
Last successful upload                       : 2013-11-13 15:36:37
Last attempted upload                        : 2013-11-13 15:36:37
Total Megabytes of XML files uploaded so far : 0.05
Number of XML files pending upload           : 0
Size of XML files pending upload(MB)         : 0
Available disk space on upload filesystem    : 91.16%
Collection Status                            : Collections enabled
Heartbeat Status                             : Ok
Last attempted heartbeat to OMS              : 2013-11-13 15:36:31
Last successful heartbeat to OMS             : 2013-11-13 15:36:31
Next scheduled heartbeat to OMS              : 2013-11-13 15:37:32

---------------------------------------------------------------

Agent is Running and Ready
Agent up and running.

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