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Unblock the agent in OEM 12C by performing an agent resync from the console

Unblock the agent in OEM 12C by performing an agent resync from the console



I am using OEM 12c. 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:

[oracle@NODE4bin]$ ./emctl upload agent
Oracle Enterprise Manager Cloud Control 12c Release 2
Copyright (c) 1996, 2012 Oracle Corporation.  All rights reserved.
---------------------------------------------------------------
EMD upload error:full upload has failed: The agent is blocked by the OMS. Agent is out-of-sync with repository. This most likely means that the agent was reinstalled or recovered. Please contact an EM administrator to unblock the agent by performing an agent resync from the console. (AGENT_BLOCKED)


Solution:

Go to agent home page from TARGET -> ALL TARGET.

Then from AGENT menu click Resynchronization.

OR

SETUP - > Manage Cloud Control -> AGENTS
Then from AGENT menu click Resynchronization.

After some time agent is reachable again.

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