Error when starting Oracle Db Console (EMCTL)

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Error : OC4J Configuration issue. /opt/oracle/102/oc4j/j2ee/OC4J_DBConsole_oracle_NET not found.

My SID is NET but the previous file does not exist and is replaced by OC4J_DBConsole_oracle_net. So simply rename the file to what he wants.

More information here.