Cry about...
Oracle Troubleshooting

ORA-12505: TNS: listener could not resolve SID given in connection description.

Symptom:

When trying to connect to Oracle the following error is generated:

ORA-12224: TNS: listener could not resolve SID given in connection description.

Cause:

The SID specified in the connection was not found in the listener’s tables. This error will be returned if the database instance has not registered with the listener.

Possible Remedy:

• Check to make sure that the SID is correct. The SIDs that are currently registered with the listener can be obtained by typing:

LSNRCTL SERVICES <listener-name>

These SIDs correspond to SID_NAMEs in TNSNAMES.ORA or DB_NAME in the initialisation file.