E-business agent won't start and I get ORA-12514 Listener error when test connecting the datab (4270007)

Stat E-business agent fails to start with following message:

 TRACE - JDBC URL:  jdbc:oracle:thin:apps/<password>@//dbname:1521/PRD1 ERROR - Unable to connect to database for environment UNIPRD1.  Please verify the APPS username and password and listener port and service name in Stat's configuration.  Exception:  Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=186646784)(ERR=12514)(ERROR_STACK=(ERROR=(CODE=12514)(EMFI=4))))

 DEBUG - JDBC connection to "apps/password" using "jdbc:oracle:thin:apps/<password>@//hostname:port/sid" failed (Io exception: Connection refused(DESCRIPTION=(TMP=)(VSNNUM=186646784)(ERR=12514)(ERROR_STACK=(ERROR=(CODE=12514)(EMFI=4)))))

  FATAL - Fatal:  Stat validation of environment failed.  Unable to start Stat Oracle Agent

And when I test connect this E-business ENV from Stat web client, I get the following error message:

ORA-12514 TNS:listener does not currently know of service requested in connect descriptor