TNS-12542: TNS:address already in use TNS-12560 TNS-00512 Linux Error: 98: Address already in use

Error:

TNS-12542: TNS:address already in use

TNS-12560: TNS:protocol adapter error

  TNS-00512: Address already in use

   Linux Error: 98: Address already in use

  

Solution:
check the listerner.ora from ORACLE_HOME/network/admin

I see two entries with same IP,So removed one value form the address and started the listener.

LISTENER =

  (DESCRIPTION_LIST =

    (DESCRIPTION =

      (ADDRESS = (PROTOCOL = TCP)(HOST = 10.11.11.1)(PORT = 1521))

(ADDRESS = (PROTOCOL = TCP)(HOST =  10.11.11.1)(PORT = 1521))

      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))

    )

  )

SID_LIST_LISTENER =

  (SID_LIST =

    (SID_DESC =

      (SID_NAME = SID1)

      (ORACLE_HOME = /u01/app/oracle/product/12.1.0.2/db_1)

    )

    (SID_DESC =

      (SID_NAME = SID2)

      (ORACLE_HOME = /u01/app/oracle/product/12.1.0.2/db_1)

    )

    (SID_DESC =

      (SID_NAME = SID3)

      (ORACLE_HOME = /u01/app/oracle/product/12.1.0.2/db_1)

    )

)