Steps to cleanly stop OMS

to stop the management server:

$ORACLE_HOME/Apache/Apache/bin/apachectl stop
$ORACLE_HOME/bin/oemctl stop oms sysman/password
shut down database normally
$ORACLE_HOME/bin/lsnrctl stop

to start

$ORACLE_HOME/bin/lsnrctl start
start database normally
$ORACLE_HOME/bin/oemctl start oms sysman/password
$ORACLE_HOME/Apache/Apache/bin/apachectl start