EM Console still listens to old default listener port 1521. Please help!

Hi,

I have changed the default port numbers for the Net Listener and EM Console HTTP, and opened them on the Linux firewall.  The remote sqlplus connection from my laptop using the new listening port is a success. 

However, when I brought up the EM Console through https://<server IP address>:<new default EM Console HTTP port>/em, the console could not connect to the database instance due to listening to the old default listener port 1521. 

ORA-12541: TNS:no listener (DBD ERROR: OCIServerAttach)

Could someone help me to correct this problem?

Thanks,

Simon