$ emctl start dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.2.0
Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
https://DBA01:5501/em/console/aboutApplication
Starting Oracle Enterprise Manager 11g Database Control ............................................................................................. failed.
------------------------------------------------------------------
Logs are generated in directory /d02/app/oracle/product/11.2.0/dbhome/dba01_DBT/sysman/log
$ cd /d02/app/oracle/product/11.2.0/dbhome/dba01_DBT/sysman/log
$ cat emagent.log
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2019-07-01 10:57:03,667 Thread-1 Starting Agent 10.2.0.4.3 from /d02/app/oracle/product/11.2.0/dbhome (00701)
2019-07-01 10:57:03,668 Thread-1 : Startup of HTTP LISTENER failure (00716)
$ ps -ef|grep -i em
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oracle 5505504 1 0 Jun 07 - 94:05 /d02/app/oracle/product/11.2.0/dbhome/bin/emagent
$ kill -9 5505504
$ ps -ef|grep -i em
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oracle 8847674 7274908 0 11:09:43 pts/0 0:00 grep -i em
$ emctl start dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.2.0
Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
https://DBA01:5501/em/console/aboutApplication
Starting Oracle Enterprise Manager 11g Database Control ...... started.
------------------------------------------------------------------
Logs are generated in directory /d02/app/oracle/product/11.2.0/dbhome/dba01_DBT/sysman/log
$
Oracle Enterprise Manager 11g Database Control Release 11.2.0.2.0
Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
https://DBA01:5501/em/console/aboutApplication
Starting Oracle Enterprise Manager 11g Database Control ............................................................................................. failed.
------------------------------------------------------------------
Logs are generated in directory /d02/app/oracle/product/11.2.0/dbhome/dba01_DBT/sysman/log
$ cd /d02/app/oracle/product/11.2.0/dbhome/dba01_DBT/sysman/log
$ cat emagent.log
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.
2019-07-01 10:57:03,667 Thread-1 Starting Agent 10.2.0.4.3 from /d02/app/oracle/product/11.2.0/dbhome (00701)
2019-07-01 10:57:03,668 Thread-1
$ ps -ef|grep -i em
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.
.
oracle 5505504 1 0 Jun 07 - 94:05 /d02/app/oracle/product/11.2.0/dbhome/bin/emagent
$ kill -9 5505504
$ ps -ef|grep -i em
.
.
.
oracle 8847674 7274908 0 11:09:43 pts/0 0:00 grep -i em
$ emctl start dbconsole
Oracle Enterprise Manager 11g Database Control Release 11.2.0.2.0
Copyright (c) 1996, 2010 Oracle Corporation. All rights reserved.
https://DBA01:5501/em/console/aboutApplication
Starting Oracle Enterprise Manager 11g Database Control ...... started.
------------------------------------------------------------------
Logs are generated in directory /d02/app/oracle/product/11.2.0/dbhome/dba01_DBT/sysman/log
$