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EM 13c: All Agents Are in Unreachable Status After Migrating OMS to New Server (Doc ID 2853873.1)

Last updated on JANUARY 17, 2023

Applies to:

Enterprise Manager Base Platform - Version 13.3.0.0.0 and later
Information in this document applies to any platform.

Symptoms

EM 13c, Multi-node OMS.
Migrated one of the OMS server to a new host and re-secured with SLB.
All Agents started reporting OMS is unreachable:

<AGENT_BASE_DIR>/agent_13.3.0.0.0/bin/emctl status agent
Oracle Enterprise Manager Cloud Control 13c Release 3
Copyright (c) 1996, 2018 Oracle Corporation. All rights reserved.
---------------------------------------------------------------
Agent Version : 13.3.0.0.0
OMS Version : (unknown)
Protocol Version : 12.1.0.1.0
Agent Home : <AGENT_BASE_DIR>/agent_inst
Agent Log Directory : <AGENT_BASE_DIR>/agent_inst/sysman/log
Agent Binaries : <AGENT_BASE_DIR>/agent_13.3.0.0.0
Core JAR Location : <AGENT_BASE_DIR>/agent_13.3.0.0.0/jlib
Agent Process ID : 6795
Parent Process ID : 6699
Agent URL : https://<AGENT_HOST>:<AGENT_PORT>/emd/main/
Local Agent URL in NAT : https://<AGENT_HOST>:<AGENT_PORT>/emd/main/
Repository URL : https://<OMS_SLB_HOST>:<OMS_SLB_UPLOAD_PORT>/empbs/upload
Started at : 2022-03-05 11:39:26
Started by user : <user>
Operating System : Linux version 3.10.0-1160.42.2.el7.x86_64 (amd64)
Number of Targets : 9
Last Reload : (none)
Last successful upload : (none)
Last attempted upload : (none)
Total Megabytes of XML files uploaded so far : 0
Number of XML files pending upload : 449
Size of XML files pending upload(MB) : 0.85
Available disk space on upload filesystem : 71.15%
Collection Status : Collections enabled
Heartbeat Status : OMS is unreachable
Last attempted heartbeat to OMS : 2022-03-05 23:32:51
Last successful heartbeat to OMS : (none)
Next scheduled heartbeat to OMS : 2022-03-05 23:33:22

---------------------------------------------------------------
Agent is Running and Ready

Securing agent failed with below error:

The OMS is not set up for Enterprise Manager Security.

Cause

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In this Document
Symptoms
Cause
Solution


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