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ORA-12542: TNS:address already in use

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solution
D:\oracle\product\10.2.0\db_1\network\admin\listener.ora
INBOUND_CONNECT_TIMEOUT_LISTENER = 0
SID_LIST_LISTENER =
   (SID_LIST =
      (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = D:\oracle\product\10.2.0\db_1)
      (PROGRAM = extproc)
   )
 )
LOG_DIRECTORY_LISTENER = G:\Listener_Trace
LISTENER =
   (DESCRIPTION_LIST =
     (DESCRIPTION =
       (ADDRESS = (PROTOCOL = TCP)(HOST = newpass)(PORT = 1521))
       (ADDRESS = (PROTOCOL = TCP)(HOST = newpass)(PORT = 1523))
     )
   )


And on client side, map net service names to recently added listener protocol address. i.e. 1523, as below:
NEWPASS_29 =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.6)(PORT = 1521))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.6)(PORT = 1523))
   )
  (CONNECT_DATA =
    (SERVER = DEDICATED)
    (SERVICE_NAME = NEWPASS) 
  )
)
after made above changes to listener.ora and tnsnames.ora, TNSPING was successful and able to create DB-link.



You may face mentioned error in following cases:
  • New installation
  • listener.ora file has been edited manually since the last listener restart
  • TCP port number is duplicated across the list of ADDRESS configurations in the listener.ora file.

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