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    Oracle 10g XE: ORA 12154 - TNS could not not resolve connect identifier

    872952
      Hello all,

      I'm a newbie to the database world. I've downloaded Oracle 10g XE and this is working fine. I've also downloaded Microsoft SQL Server 2008 R2 Trial Version and I wish to connect it to this.

      I've installed Oracle Instant Client and unzipped it in ORACLE_HOME. When I add the ODBC in Data Sources and test this I get an error: <h5>ORA 15154 - TNS could not resolve connect identifier</h5>

      I've amended the listener.ora and tnsnames.ora files and also the environment varialbe TNS_ADMIN to point to /ORACLE_HOME/Network/Admin. I've also added ORACLE_HOME to the PATH variable. I've done a tnsping and lsnrctl status in the Command Line and all looks to be fine.

      TNS_ADMIN: <h5>C:\oraclexe\app\oracle\product\10.2.0\server\NETWORK\ADMIN</h5>
      PATH: <h5>C:\oraclexe\instantclient_11_2;C:\oraclexe\app\oracle\product\10.2.0\server\bin</h5>

      My listener.ora and tnsnames.ora files are as follows:

      -----
      tnsnames.ora
      -----
      <h5>
      h1.OracleXE =
      (DESCRIPTION =
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.66)(PORT = 1521))
      (CONNECT_DATA =
      (SERVER = 192.168.1.66)
      (SERVICE_NAME = XE)
      (HS = OK)
      )
      )

      EXTPROC_CONNECTION_DATA =
      (DESCRIPTION =
      (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
      )
      (CONNECT_DATA =
      (SID = PLSExtProc)
      (PRESENTATION = RO)
      )
      )

      ORACLR_CONNECTION_DATA =
      (DESCRIPTION =
      (ADDRESS_LIST =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
      )
      (CONNECT_DATA =
      (SID = CLRExtProc)
      (PRESENTATION = RO)
      )
      )

      XE1= (DESCRIPTION=
      (ADDRESS=(PROTOCOL=TCP)
      (HOST=192.168.1.66)
      (PORT=1521))

      (CONNECT_DATA = (SERVICE_NAME = XE)
      )

      (HS = OK))

      </h5>
      -----
      listener.ora
      -----
      <h5>
      SID_LIST_LISTENER =
      (SID_LIST =
      (SID_DESC =
      (SID_NAME = PLSExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
      (PROGRAM = extproc)
      )
      (SID_DESC =
      (SID_NAME = CLRExtProc)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
      (PROGRAM = extproc)
      )
      (SID_DESC =
      (SID_NAME = XE)
      (ORACLE_HOME = C:\oraclexe\app\oracle\product\10.2.0\server)
      (PROGRAM = HSODBC)
      )
      )

      LISTENER =
      (DESCRIPTION_LIST =
      (DESCRIPTION =
      (ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC_FOR_XE))
      (ADDRESS = (PROTOCOL = TCP)(HOST = 192.168.1.66)(PORT = 1521))
      )
      )

      DEFAULT_SERVICE_LISTENER = (XE)
      </h5>

      Any help would be very much appreciated. I've tried everything but no success at all.
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