ORA-12504: TNS:listener was not given the SID in CONNECT_DATA
 *Cause:  The SID was missing from the CONNECT_DATA.
 *Action: Check that the connect descriptor corresponding to the service
 name in TNSNAMES.ORA has an SID component in the CONNECT_DATA.

12504, 00000, "TNS:listener was not given the SERVICE_NAME in CONNECT_DATA"
// *Cause:  The listener was not configured with a default service and
//  SERVICE_NAME was missing from the CONNECT_DATA received by the listener.
// *Action: Possible solutions are:
//  - Configure DEFAULT_SERVICE parameter in LISTENER.ORA with a valid service
//    name. Reload the listener parameter file using reload [<listener_name>].
//    This should be done by the LISTENER administrator.
//  - If using a service name, Check that the connect descriptor corresponding
//    to the service name in TNSNAMES.ORA has a SERVICE_NAME or SID component
//    in the CONNECT_DATA.

POC =
  (DESCRIPTION =
      (ADDRESS = 
         (PROTOCOL = TCP)
         (HOST = 175.25.115.105)
         (PORT = 1533))
      (CONNECT_DATA =
         (SID = FGIGT))
  )

EQS =
  (DESCRIPTION =
      (ADDRESS = 
         (PROTOCOL = TCP)
         (HOST = 175.26.75.35)
         (PORT = 1521))
      (CONNECT_DATA =
         (SID = BGIGT))
  )