Io Exception: the network adapter could not establish the connection

Sometimes I got some errors while trying to setup an database to get access through a network which has a very complex firewall and so I have to start “messing” around the listeners and other oracle network configuration that when I get it solved I have problems to make my Enterprise Manager to work, even restarting it after the modifications.

If you wants to make problems like that to disappears, here’s how to do (always works to me)

Change the default entries on the file ORACLE_HOME/hostname_sid/sysman/emd/targets.xml and ORACLE_HOME/hostname_sid/sysman/config/emoms.properties

Make the modifications you guess is necessary, like ports, oracle_home, SID, etc…

Now start the emctl again, and yeapp it will be working =]