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Error connecting through SQL*Plus

I am able to connect to the Oracle9i server through network configuration tools -- network manager and testing the connection. I am getting the following result.

Initializing first test to use userid: scott, password: tiger.
Attempting to connect using userid: scott

The connection test was successful. But if I try to connect through the SQL*Plus, I get the ORA-12514: tns: service name could not be resolved. What might be the problem?

I have the following in tnsnames.ora

# TNSNAMES.ORA Network Configuration File:
D:oracleora90networkadmintnsnames.ora
# Generated by Oracle configuration tools.

HPHIS.DIGITALINDIASW.NET =
  (DESCRIPTION =
    (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = TCP)(HOST = dcnew4)(PORT = 1521))
    )
    (CONNECT_DATA =
      (SERVICE_NAME = hphis)
    )
  )

When you try to connect through SQL*Plus, make sure you are using this form: sqlplus scott/tiger@HPHIS.DIGITALINDIASW.NET You may have to use the entire TNS alias. Also make sure that your TNSNAMES.ORA file is in the %ORACLE_HOME%networkadmin directory. If it is in a different directory, then make sure your TNS_ADMIN environment variable is set to the directory that contains this file.

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