EM 13c: Newly Installed Agent getting Metric collection Error (Doc ID 2983142.1)

2023-10-19 14:33:20,206 [Job Step 7798 Job Long-System Pool:JobWorker] ERROR target.EntityUtil logp.251 - PromoteTarget for agent: https://<abc.xyz.com>:3872/emd/main/with changeSequence: 1429 got Exception with Message: unable to connect to
http server at https://<abc.xyz.com>:3872/emd/main/. [handshake has no peer] isTransientExceptionThrown: 0
oracle.sysman.emSDK.agent.comm.exception.VerifyConnectionException: unable to connect to http server at https://<abc.xyz.com>:3872/emd/main/. [handshake has no peer]

[oracle@<HOST_NAME> security]$ emctl secdiag openurl -url https://<abc.xyz.com>:3872/emd/main/
Oracle Enterprise Manager Cloud Control 13c Release 5
Copyright (c) 1996, 2021 Oracle Corporation. All rights reserved.

Log file: /tmp/OpenPage_2023_10_19_20_05_118698986609365569521.log
2023-10-19 20:05:12,235 main ERROR Unable to locate appender "logAppeder" for logger config "root"

Opening page: https://<abc.xyz.com>:3872/emd/main/
Using non-validating trust manager; all certificates will be blindly accepted.
Proxy server is not set
Using protocol: TLSv1

Negotiated protocol: NONE

Getting the certificate chain
Following exception occurred when running OpenPage
javax.net.ssl.SSLPeerUnverifiedException: peer not authenticated
at sun.security.ssl.SSLSessionImpl.getPeerCertificateChain(SSLSessionImpl.java:625)
at oracle.sysman.emctl.secdiag.OpenURL.main(OpenURL.java:261)
[oracle@BAHS171 ~]$ openssl s_client -host <abc.xyz.com> -port 3872
CONNECTED(00000003)
write:errno=104
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no peer certificate available
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No client certificate CA names sent
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SSL handshake has read 0 bytes and written 289 bytes
Verification: OK
---
New, (NONE), Cipher is (NONE)
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
Early data was not sent
Verify return code: 0 (ok)
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