How To Resolve Agent Stuck Issue

How To Resolve Agent Stuck Issue:
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Workout
1. emctl stop agent
2. ps -ef | grep emagent
kill all the process
3. emctl start agent
Oracle Enterprise Manager 11g Release 1 Grid Control 11.1.0.1.0
Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
Starting agent …………………………………………………………………………………………………………… started but not ready.

Solution
emctl unsecure agent
emctl secure agent

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[oracle@SERVER01:DB123] emctl secure agent
Oracle Enterprise Manager Cloud Control 13c Release 4
Copyright (c) 1996, 2020 Oracle Corporation. All rights reserved.
Agent is already stopped… Done.
Securing agent… Started.
Enter Agent Registration Password :
Securing agent… Successful.
[oracle@SERVER01:DB123] emctl status agent
Oracle Enterprise Manager Cloud Control 13c Release 4
Copyright (c) 1996, 2020 Oracle Corporation. All rights reserved.
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Agent is Not Running
[oracle@SERVER01:DB123] emctl start agent
Oracle Enterprise Manager Cloud Control 13c Release 4
Copyright (c) 1996, 2020 Oracle Corporation. All rights reserved.
Starting agent ……………. started.
[oracle@SERVER01:DB123] emctl status agent
Oracle Enterprise Manager Cloud Control 13c Release 4
Copyright (c) 1996, 2020 Oracle Corporation. All rights reserved.
—————————————————————
Agent Version : 13.4.0.0.0
OMS Version : 13.4.0.0.0
Protocol Version : 12.1.0.1.0
Agent Home : /u01/app/oracle/product/agent13c/agent_inst
Agent Log Directory : /u01/app/oracle/product/agent13c/agent_inst/sysman/log
Agent Binaries : /u01/app/oracle/product/agent13c/agent_13.4.0.0.0
Core JAR Location : /u01/app/oracle/product/agent13c/agent_13.4.0.0.0/jlib
Agent Process ID : 82708
Parent Process ID : 82648
Agent URL : https://SERVER01:3872/emd/main/
Local Agent URL in NAT : https://SERVER01:3872/emd/main/
Repository URL : https://SERVER01:4903/empbs/upload
Started at : 2020-11-04 07:09:19
Started by user : oracle
Operating System : Linux version 3.10.0-1160.2.2.el7.x86_64 (amd64)
Number of Targets : 62
Last Reload : (none)
Last successful upload : 2020-11-04 07:09:54
Last attempted upload : 2020-11-04 07:09:54
Total Megabytes of XML files uploaded so far : 0.19
Number of XML files pending upload : 0
Size of XML files pending upload(MB) : 0
Available disk space on upload filesystem : 20.16%
Collection Status : Collections enabled
Heartbeat Status : Ok
Last attempted heartbeat to OMS : 2020-11-04 07:09:31
Last successful heartbeat to OMS : 2020-11-04 07:09:31
Next scheduled heartbeat to OMS : 2020-11-04 07:10:32

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Agent is Running and Ready
[oracle@SERVER01:DB123]