TNSPING OK but sqlplus gives ORA-12154?

Question

I have Oracle 11 running on a Windows server and I\'m logged onto the same server trying to use SQL Plus. When I try to connect I get a ORA-12154 even though TNSPING and var

Answer 1

Sqlplus will give this error if you have an at-sign (@) in your password, which you do. Sqlplus thinks you are inputting the connection string as a parameter. Change your password (you can do this with SQL Developer).

Moral: Don't use at-signs in Oracle passwords.