Calling updateConfig to notify DCM of new deployments..done. ERROR: updateConfig failed.

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Problem:    

While applying 10.1.2.3 Oracle Application Server patchset in a High-Availability Environment SSO node2, patching fails at the OC4J Instance Configuration Assistant with the following errors

Calling updateConfig to notify DCM of new deployments..done.
ERROR: updateConfig failed.
Error message returned is: Instance: Message: The DCM is down on one of the Oracle Application Server instances in the cluster. This is typically run as part of the "Enterprise Management Daemon" or as a separate DCM daemon. 

ERROR! DEPLOY TOOL CANNOT CONTINUE DEPLOYMENTS: could not update DCM repository with newly deployed applications - ALL APPLICATIONS WILL BE UNDEPLOYED.

Undeploying application 'wirelesssso' from OC4J instance 'OC4J_SECURITY'.Application 'wirelesssso' successfully undeployed.
Undeploying application 'oiddas' from OC4J instance 'OC4J_SECURITY'.Application 'oiddas' successfully undeployed.
Undeploying application 'sso' from OC4J instance 'OC4J_SECURITY'.Application 'sso' successfully undeployed.
Stopping OC4J instance 'OC4J_SECURITY'..done.
Terminating DCM..done.
Copying /u01/app/oracle/product/10.1.2/SSO/j2ee/deploy.ini to /u01/app/oracle/product/10.1.2/SSO/j2ee/deploy.ini.1249536328150.bak.
Writing any undeployed entries back to /u01/app/oracle/product/10.1.2/SSO/j2ee/deploy.ini.

Oc4jDeploy tool completed, but with errors.

Configuration assistant "OC4J Instance Configuration Assistant" failed

Log files:

Installer_log.rtf

Filename = <a href="http://sew.oraclecorp.com/SEW/fileDownload?forceDownload=0&fileURL=https%3A%2F%2Fgtcr.oracle.com%2Fgtcr-dir%2Fgtcr_4607%2F7644879.993%2FInstaller_log.rtf"target="_blank">https://gtcr.oracle.com/gtcr-dir/gtcr_4607/7644879.993/Installer_log.rtf</a>

Calling updateConfig to notify DCM of new deployments..done.
ERROR: updateConfig failed.
Error message returned is: Instance: Message: The DCM is down on one of the Oracle Application Server instances in the cluster. This is typically run as part of the "Enterprise Management Daemon" or as a separate DCM daemon. 

ERROR! DEPLOY TOOL CANNOT CONTINUE DEPLOYMENTS: could not update DCM repository with newly deployed applications - ALL APPLICATIONS WILL BE UNDEPLOYED.

Undeploying application 'wirelesssso' from OC4J instance 'OC4J_SECURITY'.Application 'wirelesssso' successfully undeployed.
Undeploying application 'oiddas' from OC4J instance 'OC4J_SECURITY'.Application 'oiddas' successfully undeployed.
Undeploying application 'sso' from OC4J instance 'OC4J_SECURITY'.Application 'sso' successfully undeployed.
Stopping OC4J instance 'OC4J_SECURITY'..done.
Terminating DCM..done.
Copying /u01/app/oracle/product/10.1.2/SSO/j2ee/deploy.ini to /u01/app/oracle/product/10.1.2/SSO/j2ee/deploy.ini.1249536328150.bak.
Writing any undeployed entries back to /u01/app/oracle/product/10.1.2/SSO/j2ee/deploy.ini.

Oc4jDeploy tool completed, but with errors.

Configuration assistant "OC4J Instance Configuration Assistant" failed

Solution:

ensure that the dcm-daemon is running on all the nodes of the cluster.

1. Ensure that the dcm-daemon is running on all the nodes of the cluster.

2. To confirm the same, check the output of the following command from all the nodes
ORACLE_HOME/opmn/bin> opmnctl status

3. After starting the 'dcm-daemon', execute the following command and confirm the status
ORACLE_HOME/dcm/bin> dcmctl getState

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