Dynamic registration failed for Scan Listener in Oracle RAC Environment

If dynamic service is failed to register the scan listener then you follow the following steps to try the registration:

1. Check the TNSADMIN parameter is set or point to correct location.
2. Remove the tnsnames.ora entry for scan listener (note: first backup the tnsnames.ora, sqlnet.ora or listerner.ora file)
3. Set the following entry in SQLNET.ORA file and need to restart the instance & listener so that PMON read first SQLNET.ora file for dynamic registration.

NAMES.DIRECTORY_PATH=(EZCONNECT,TNSNAMES)

4. If dynamic registration is not work, then create a manual entry in tnsnames.ora file for scan listener and set the REMOTE_LISTENER parameter on all nodes. Then fire the command alter system register for registration.

-- Make an entry in tnsnames.ora file of each node for scan listener:

DB_LISTENERS_SCAN=
    (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.10.10.01)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.10.10.02)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.10.10.03)(PORT = 1521))
    )

--- Update the remote_listener parameter point to scan listener for each node:

SQL>Alter system set REMOTE_LISTENER='DB_LISTENERS_SCAN' scope=both sid='*';
SQL>Alter system register;