EM 12c: Agent Status Fails With "Status agent Failure:unable to connect to http server at <agent_url> failed to match hostname with certificate DN (Doc ID 2125236.1)

Last updated on JANUARY 22, 2024

Applies to:

Symptoms

12c agent start fails with following error:

<AGENT_INST_HOME>/bin>./emctl start agent
Oracle Enterprise Manager Cloud Control 12c Release 5
Copyright (c) 1996, 2015 Oracle Corporation. All rights reserved.
Agent status could not be determined. Check the agent process
Consult emctl.log and emagent.nohup in: /opt/ora11g/product/agent12/agent_inst/sysman/log

Checking the agent Status shows following error:

<AGENT_INST_HOME>/bin>./emctl status agent
Oracle Enterprise Manager Cloud Control 12c Release 5
Copyright (c) 1996, 2015 Oracle Corporation. All rights reserved.
---------------------------------------------------------------
Status agent Failure:unable to connect to http server at https://<Agent host name>.<domain>:1830/emd/lifecycle/main/. [failed to match hostname <Agent host name> with 
certificate DN CN=<host name 2>.<domain>]

       The host names shown in the error message are different host names.

       /core/12.1.0.5.0/cfgtoollogs/oui/configActions2016-04-05_02-42-12-PM.log

       Agent Configuration completed successfully
      Oracle Enterprise Manager Cloud Control 12c Release 5
      Copyright (c) 1996, 2015 Oracle Corporation. All rights reserved.
      Agent status could not be determined. Check the agent process
      Consult emctl.log and emagent.nohup in: /opt/ora11g/product/agent12/agent_inst/sysman/log
      Verificando agente ...
      Oracle Enterprise Manager Cloud Control 12c Release 5
      Copyright (c) 1996, 2015 Oracle Corporation. All rights reserved.
      ---------------------------------------------------------------
      Status agent Failure:unable to connect to http server at https://<Agent host name>.<domain>:1830/emd/lifecycle/main/. [failed to match <Agent host name>.<domain> with certificate DN CN=<Agent host name>]

OR

./emctl status agent
Oracle Enterprise Manager Cloud Control 12c Release 4
Copyright (c) 1996, 2014 Oracle Corporation. All rights reserved.
---------------------------------------------------------------
Status agent Failure:unable to connect to http server at https://<Agent host name>.<domain>:3872/emd/lifecycle/main/. [failed to match hostname <Agent host name>.<domain> with certificate DN CN=<Agent host name>]

/cfgtoollogs/oui/configActions2016-04-05_02-42-12-PM.log
Agent Configuration completed successfully
Oracle Enterprise Manager Cloud Control 12c Release 5
Copyright (c) 1996, 2015 Oracle Corporation. All rights reserved.
Agent status could not be determined. Check the agent process
Consult emctl.log and emagent.nohup in: /agent_inst/sysman/log
Verificando agente ...
Oracle Enterprise Manager Cloud Control 12c Release 5
Copyright (c) 1996, 2015 Oracle Corporation. All rights reserved.
---------------------------------------------------------------
Status agent Failure:unable to connect to http server at https://<Agent host name>.<domain>:1830/emd/lifecycle/main/. [failed to match hostname <hostname> with certificate DN CN=<Agent host name>.<domain>]

The host names shown in the error are the fully qualified domain name (FQDN) and the short host name.

Cause

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