ORA-28547 error for the second connection

Hi, all,

Sorry to re-post this question here (original one was on dbforums.com). It is something urgent.

Currently, I am facing a very weired problem.

I can use SqlPlus to connect to the DB. However, if I try to use "connect" command to switch to another login/password with the same DB, I always got:

ORA-28547: connection to server failed, probable Oracle Net admin error

I believe the settings on TNS and Listener are good, otherwise I could fail in the first login/connect. Also I have tried to have many sqlplus to connect to the DB at almost the time, and it was all good, so no session limit problem, just none of them allowed me to do the second connect.

Can anyone shed some light? I need to run some complex script, which needs to do this "connect" thing several times.

Thank you very much for any tips to save my life.

Ben

P.S.

I am using oracle 10gR2, on windows xp sp2 (32 bits), with AMD Athlon 64X2 Dual Core 3800+ (does 64 bits cause the problem?)

• listener.ora ==

SID_LIST_LISTENER =
(SID_LIST =
(SID_DESC =
(SID_NAME = PLSExtProc)
(ORACLE_HOME = C:\oracle\product\10.2.0\db_1)
(PROGRAM = extproc)

)
)

LISTENER =
(DESCRIPTION_LIST =
(DESCRIPTION =
(ADDRESS = (PROTOCOL = TCP)(HOST = mypc.mycompany.com)(PORT = 1521))
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
)

• TNSNames.ora ==

CCMDB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = localhost)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = mydb)

)
)

EXTPROC_CONNECTION_DATA =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = IPC)(KEY = EXTPROC0))
)
(CONNECT_DATA =
(SID = PLSExtProc)
(PRESENTATION = RO)

)
) Received on Wed Dec 20 2006 - 22:39:37 CST