oracle error ORA-12154

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Hi, I'm trying to connect to an oracle 9.20 database using:

$conn = OCILOGON("dah50","dah50","zed2.aleph0");

but I get the error ORA-12154

Searching on google says my listener.ora or tnsnames.ora may have 
problems, but I think mine are correct.  Can someone take a look and see 
if they are ok?  Also, I can connect to the database from the command 
line:

ORACLE>>sqlplus dah50/dah50@xxxxxxxxxxx

SQL*Plus: Release 9.2.0.3.0 - Production on Fri Jul 16 11:58:49 2004

Copyright (c) 1982, 2002, Oracle Corporation.  All rights reserved.


Connected to:
Oracle9i Enterprise Edition Release 9.2.0.3.0 - Production
With the Partitioning, OLAP and Oracle Data Mining options
JServer Release 9.2.0.3.0 - Production


so I'm not really sure what is going on.  below are my tnsnames.ora and 
listener.ora:


tnsnames.ora
------------

zed2.aleph0=(description=
                (address=
                        (protocol=ipc)
                        (key=aleph0))
                (address=
                        (protocol=tcp)
                        (host=zed2.mdah.state.ms.us)
                        (port=1521))
                (connect_data=(service_name=aleph0)(server=DEDICATED)))



listener.ora
------------

listener=(description=
                (address_list=
                        (address =
                                (protocol = ipc)
                                (key = extproc))
                        (address=
                                (protocol=ipc)
                                (key=aleph0))
                        (address=
                                (protocol=tcp)
                                (host=zed2.mdah.state.ms.us)
                                (port=1521))
                )
           )

sid_list_listener=(sid_list=
                        (sid_desc=
                                (global_name=aleph0)
                                (sid_name=aleph0)
                                (oracle_home=/exlibris/app/oracle/product/920)
                        )
                        (sid_desc =
                                (sid_name = extproc)
                                (oracle_home=/exlibris/app/oracle/product/920)
                                (program = extproc)
                        )
                  )
startup_wait_time_listener=0
connect_timeout_listener=20
trace_level_listener=off




and when I start the listener I get no errors.

ORACLE>>lsnrctl stop ; lsnrctl start

LSNRCTL for Linux: Version 9.2.0.3.0 - Production on 16-JUL-2004 12:07:11

Copyright (c) 1991, 2002, Oracle Corporation.  All rights reserved.

Connecting to (DESCRIPTION=(address=(protocol=ipc)(key=extproc)))
The command completed successfully

LSNRCTL for Linux: Version 9.2.0.3.0 - Production on 16-JUL-2004 12:07:11

Copyright (c) 1991, 2002, Oracle Corporation.  All rights reserved.

Starting /exlibris/app/oracle/product/920/bin/tnslsnr: please wait...

TNSLSNR for Linux: Version 9.2.0.3.0 - Production
System parameter file is 
/exlibris/app/oracle/product/920/network/admin/listener.ora
Log messages written to 
/exlibris/app/oracle/product/920/network/log/listener.log
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=extproc)))
Listening on: (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=aleph0)))
Listening on: 
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=zed2.mdah.state.ms.us)(PORT=1521)))

Connecting to (DESCRIPTION=(address=(protocol=ipc)(key=extproc)))
STATUS of the LISTENER
------------------------
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version 9.2.0.3.0 - 
Production
Start Date                16-JUL-2004 12:07:11
Uptime                    0 days 0 hr. 0 min. 0 sec
Trace Level               off
Security                  OFF
SNMP                      OFF
Listener Parameter File   
/exlibris/app/oracle/product/920/network/admin/listener.ora
Listener Log File         
/exlibris/app/oracle/product/920/network/log/listener.log
Listening Endpoints Summary...
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=extproc)))
  (DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=aleph0)))
  
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=zed2.mdah.state.ms.us)(PORT=1521)))
Services Summary...
Service "aleph0" has 1 instance(s).
  Instance "aleph0", status UNKNOWN, has 1 handler(s) for this service...
Service "extproc" has 1 instance(s).
  Instance "extproc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully

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