Oracle error: "ORA-12560: TNS: protocol adapter error."

[Jolied]

Hello! Got an Oracle 11g home computer. I'm launching SQL Plus and I'm injecting a default user. Login: su, password is empty. There's a mistake in the entrance: "ERROR: ORA-12560: TNS: protocol adapter error." Help me find where the passwords and logic of Oracle users are built.

[fbio]

1. You haven't written anything about whether you've created an O.D. or not.
2. Check if TNS listener: tnsping %ORACLE_SID%♪
3. The simplest way to check whether the OBD is raised correctly or not telnet localhost 1521♪
4. Start a service.msc and visually check the state of services called Oracle* service, in specialty OracleService%ORACLE_SID%♪

ORACLE_SID - that's the name of your OBD instas. Usually the oracle creates this variable automatically. You can check: echo %ORACLE_SID% (in principle, you should know her - once you've had the OBD.

Google: ask tom ERROR: ORA-12560: TNS: protocol adapter error♪