How to resolve Agent Unreachable errors in Enterprise Manager Cloud Control 13c

I encountered such an error in Enterprise Manager Cloud Control 13C

In the Cloud Control Manager Target , you may see issue of rack showing status as “Down” when running “show status” button

Please follow the steps below for solition..

Go to the directory where Agent in is installed.

<AGENT-HOME>/bin/emctl stop agent

Take a backup of <AGENT-HOME>/sysman/config/emd.properties and edit it

agentJavaDefines=-Xmx128M -XX:MaxPermSize=256M

Take a backup of <AGENT-HOME>/sysman/config/s_jvm_options.opt and edit it

-XX:+UseMembar

<AGENT-HOME>/bin/emctl start agent

follow the emagent.nohup

Go to the directory where Cloud control in is installed.

/oms/bin ./emctl stop oms

Oracle Enterprise Manager Cloud Control 13c Release 3
Copyright (c) 1996, 2018 Oracle Corporation. All rights reserved.
Stopping Oracle Management Server…
Oracle Management Server Successfully Stopped
Oracle Management Server is Down

/oms/bin ./emctl start oms

Oracle Enterprise Manager Cloud Control 13c Release 3
Copyright (c) 1996, 2018 Oracle Corporation. All rights reserved.
Starting Oracle Management Server…
WebTier Successfully Started
Oracle Management Server Successfully Started
Oracle Management Server is Up
JVMD Engine is Up
Starting BI Publisher Server …
BI Publisher Server Already Started
BI Publisher Server is Up

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