OEM13cR5: Agent Is Not Starting On Exadata Node After DomU Patching
(Doc ID 3073532.1)
Last updated on MARCH 13, 2025
Applies to:
Enterprise Manager Base Platform - Version 13.5.0.0.0 and laterInformation in this document applies to any platform.
Symptoms
OEM: 13cR5
In Oracle Enterprise Manager Cloud Control, Agent is unable to start post patching of DomU on Exadata node level. Even though the OMS to Agent port communication and vice-versa working agent is unable to start.
$ ./emctl start agent
Oracle Enterprise Manager Cloud Control 13c Release 5
Copyright (c) 1996, 2021 Oracle Corporation. All rights reserved.
Starting agent .......................................... failed.
HTTP Listener failed at Startup
Possible port conflict on port(3872): Retrying the operation.....
Failed to start the agent after 3 attempts. Please check that the port(3872) is available.
Consult emctl.log and emagent.nohup in: /u02/app/oracle/agent/agent_inst/sysman/log
Oracle Enterprise Manager Cloud Control 13c Release 5
Copyright (c) 1996, 2021 Oracle Corporation. All rights reserved.
Starting agent .......................................... failed.
HTTP Listener failed at Startup
Possible port conflict on port(3872): Retrying the operation.....
Failed to start the agent after 3 attempts. Please check that the port(3872) is available.
Consult emctl.log and emagent.nohup in: /u02/app/oracle/agent/agent_inst/sysman/log
Communication Checks:
From OMS:
ping <agent-hostname>
telnet <agent-hostname> <agent-port>
nslookup <agent-hostname>
cat /etc/hosts | grep -i <agent-hostname>
openssl s_client -connect <agent-hostname>:<agent-port>
From Target Agent:
ping <oms/slb hostname>
telnet <oms/slb hostname> <oms/slb https upload port>
nslookup <oms/slb hostname>
cat /etc/hosts | grep -i <oms/slb hostname>
openssl s_client -connect <oms/slb hostname>:<oms/slb upload port>
ping <agent-hostname>
telnet <agent-hostname> <agent-port>
nslookup <agent-hostname>
cat /etc/hosts | grep -i <agent-hostname>
openssl s_client -connect <agent-hostname>:<agent-port>
From Target Agent:
ping <oms/slb hostname>
telnet <oms/slb hostname> <oms/slb https upload port>
nslookup <oms/slb hostname>
cat /etc/hosts | grep -i <oms/slb hostname>
openssl s_client -connect <oms/slb hostname>:<oms/slb upload port>
Cause
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In this Document
| Symptoms |
| Cause |
| Solution |
| References |