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OracleDBConsole service start failed @ host IP | name changed.
When host ip, or name changes, an error occurs.

It occurs emctl start service error. To solve this error, step by flowing: 
set oracle_sid=mes
mes is the sid of oracle. 
emctl start dbconsole
Then, a message "OC4J Configuration issue. C:\oracle\product\10.1.0\Db_1/oc4j/j2ee/OC4J_DBConsole_10.1.3.121_mes not found." is displayed. Copy the fold %ORACLE_HOME%\product\10.1.0\Db_1\oc4j\j2ee\OC4J_DBConsole_cci-r3_mes to %ORACLE_HOME%\product\10.1.0\Db_1\oc4j\j2ee\OC4J_DBConsole_10.1.3.121_mes and try start service again. 
emctl start dbconsole
Another message "EM Configuration issue. C:\oracle\product\10.1.0\Db_1/10.1.3.121_mes not found." is returned. Copy fold %ORACLE_HOME%\product\10.1.0\Db_1\cci-r3_mes to %ORACLE_HOME%\product\10.1.0\Db_1\10.1.3.121_mes. and restart service again. Service will start successfully.