3.7.0 HP StorageWorks MxDB-Oracle-HiAv installation and administration guide HP MxDB-Oracle-HiAv for Linux (AG513-96009, June 2009)

emca -reconfig ports -DBCONTROL_HTTP_PORT <port_number>
The EMCA configuration is very difficult to repair or undo. Although some
troubleshooting techniques, including those mentioned in this document exist,
sometimes the best course of action is to re-install Oracle on that node.
Implement Oracle Enterprise Manager DB Console with the Virtual Oracle Service66