EM cannot start again fully configured EM, the port number becomes 5500

The original configuration is deleted first:
Emca-repos Drop

Database SID: * * *
Listener Port number: 1521
SYS User's password:
Sysman User's password:
Sysman User's password:
Do you want to continue? [Yes (y)/no (N)]: Y
EMCA ended on 2007-11-19 14:48:13

Emca-repos Create

Enter the following information:
Database SID: * * *
Listener Port number: 1521
SYS User's password:
Sysman User's password:

Do you want to continue? [Yes (y)/no (N)]: Y

Emca-config Dbcontrol DB

Database SID: * * *
Database control has been configured for DB Tuosi
You have chosen to configure database control to manage databases * * *
This action will remove the existing configuration and default settings and perform the configuration again
Do you want to continue? [Yes (y)/no (N)]: Y
Listener Port number: 1521
SYS User's password:
DBSNMP User's password:
User name/password is not valid.
DBSNMP User's password:
Sysman User's password:
Email address of the notification (optional):
Notification of the outgoing (SMTP) server (optional):
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The following settings are specified

Database Oracle_home .......... E:/oracle/product/10.2.0/db_1

Database host name ..... server----
Listen to the program port number ....... 1521
Database SID ... tuosi. ........
e-mail address of the notification ... .....
Notification of the outgoing (SMTP) server ........

-----------------------------------------------------------------
Do you want to continue? [Yes (y)/no (N)]: Y

View Emctl Status Dbconsole