ORA-12543: TNS:destination host unreachable

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SQL> conn
Enter user-name: system
Enter password
ERROR:
ORA-12543: TNS:destination host unreachable

 ------------------------------------------------------------------------------------------------------------------
One of the reasons why this type of error occurs is that if our password contain @  symbol.

 The way how to solve it is

 1. Change the password (password should not contain @).
     
2. Without changing password, While entering the password, use double quotes  " at the beginning and at the end of the password.

  ---> Lets my password is   abc@123

 SQL> conn
Enter user-name: system
Enter password: "abc@123"

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