OracleRemExecService is a service which is only used temporarily by the OUI It gets removed when OUI is finished with it, therefore, it will have a value of 'DISABLED' until a reboot - then it will simply be gone, ignore and leave this service untouched. The Oracle Windows service "OracleRemExecService" to execute various commands from Oracle applications like DBCA and GUI. The service itself relies on a named pipe to receive the commands.
If you are using dynamic listener registration (instance registration). The instance does not register with the listener until you mount the controlfile. Without sysdba, Net service name using SID or Net service name using SERVICE_NAME with UR=A . RMAN requires a static listener entry and the tnsnames.ora should not contain FAIL_OVER=ON or LOAD_BALANCING. Just a plain vanilla dedicated server connection. RMAN-00554: initialization of internal recovery manager package failed RMAN-04005: error from target database: ORA-12528: TNS:listener: all appropriate instances are blocking new connections
Oracle GoldenGate can run on a machine separate from the source and/or target database server. The setup is called GoldenGate remote capturing and delivery . A creation of a GoldenGate Replicate Hub . On Oracle Databases the remote capture can be a remote integrated capture or downstream capture. For remote delivery can be an integrated delivery, a coordinated delivery or classic delivery. Architect overview GoldenGate Replicatie Hub - Remote Capture and Delivery