Oracle Enterprise Manager 10g Release 5 Grid Control 10.2.0.5.0.
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EMD pingOMS error: Invalid ping response "ERROR-Agent is blocked. Blocked reason is: 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. Please contact EM adminstrator to unblock the agent"
Solution: log into OEM. Click on all target. Select Agent from drop down list. Select the agent which was blocked. click on unblock to unblock the agent.