O problema parece estar no nome da maquina que não pode ter caracteres especiais para que se conecte ao Oracle. Bem, um amigo me conseguiu uma descrição e vou repassar a vocês, segue logo abaixo.
Até mais ....
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"Solution Description
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You need to verify that the client computer's identification does not
contain reserved characters. Particularly the parenthesis symbols: ( ).
To check on Windows95/98/NT:
1. Right click the Network Neighborhood Icon on your desktop.
2. Select Properties.
3. Within the Network Properties window, select the Identification Tab.
4. Verify the Computer Name box does not contain any of the reserved
symbols, change if necessary.
5. Check the DNS configuration.
6. On Windows NT, select the Protocols Tab, on Windows95/98 select the
TCP/IP-> Network Adapter from the list under the Configuration Tab.
7. Select Properties.
8. Select the DNS Tab on NT, DNS Configuraiton on Windows98/95.
9. Verify the Host Name box does not contain any of the reserved
symbols, change if necessary.
*NOTE: If you have to change the Computer Name, you will have to
reboot to have the changes take affect. You may also need
mount the Operating System disk for Windows95/98/NT to copy
in new files.
Explanation
-----------
You are using reserved symbols to identify the client computer.
Sqlnet/Net8 has a character set for keyword value entries, which is
restricted to single-byte characters. However certain single-byte
characters are reserved symbols within Sqlnet/Net8.
These reserve symbols are:
( ) = \ " ' #
Sqlnet/Net8 passes client information, such as host, username, and
program executable to the database during connection establishment
as part of an 'exteneded' connected discriptor. Using a reserved
character can cause connection failures resulting in ORA-6413,
Connection not open errors. In particular the open and close
parenthesis symbols ( ) being used to identify the client computer.
This would be noticeable in the Sqlnet.log where the errors are shown.
For example, here is an excerpt from a Sqlnet.log (using wordwrap for
display purposes), showing the connect failure using "ALPHA (TEST)" as
hostname.
***********************************************************************
Fatal OSN connect error 6413, connecting to:
(DESCRIPTION=(ADDRESS_LIST=(ADDRESS=(PROTOCOL=BEQ)(PROGRAM=oracle80)
(ARGV0=oracle80ORCL)(ARGS='(DESCRIPTION=(LOCAL=YES)(ADDRESS=(PROTOCOL=beq)))')
))
(CONNECT_DATA=(SID=ORCL)
(CID=(PROGRAM=PLUS33.EXE)(HOST=ALPHA (TEST))(USER=Oracleuser))))
^^^^^^^^^^^^^^^^^
VERSION INFORMATION:
TNS for 32-bit Windows: Version 2.3.4.0.0 - Production
Time: 14-OCT-99 23:23:49
Tracing not turned on.
***********************************************************************
Note1: The actual connect descriptor in Tnsnames.ora specifies TCP as
the protocol, not Beq, but because the client hostname contains the
parenthesis, Sqlnet/Net8 just breaks trying to setup and interupt
handler and write Beq protocol to the Sqlnet.log.
In the Sqlnet trace you would see an attempt to set up an interupt handler.
Excerpt from Sqlnet.trc (level 16 trace)
onstns: osntns: setting up interrupt handler...
-<ERROR>- onstns: Couldn't connect, returning 6413
onstns: exit
Note2: It is possible to have the Computer Name and the Internet
host name different. If the computer name is changed in the
Identification Tab, it will overwrite the host name in the DNS
configuration.
"