Problem with client connect to server

Hello
I'm having problems trying to connect a Windows NT client to an Oracle 8.1.5.0.2 server running on
Redhat linux 6.1
I've setup the listener, which seems to allow a sqlplus client running on the server to connect to the
database through the listener.
<snip>
$ sqlplus scott/tiger@8idb
SQL*Plus: Release 8.1.5.0.0 - Production on Mon Apr 10 16:44:57 2000
(c) Copyright 1999 Oracle Corporation. All rights reserved.
Connected to:
Oracle8i Release 8.1.5.0.2 - Production
With the Java option
PL/SQL Release 8.1.5.0.0 - Production
SQL>
</snip>
Listener.log
<snip>
10-APR-00 16:44:57 *
(CONNECT_DATA=(SERVICE_NAME=8idb)(CID=(PROGRAM=)(HOST=dbserver)(USER=oracle))) *
(ADDRESS=(PROTOCOL=tcp)(HOST=10.0.0.10)(PORT=2816)) * establish * 8idb * 0
<snip>
But when I try to test the connection from the NT client using "Net8 Easy Config"
<snip>
Initializing first test to use userid: scott, password: tiger
Attempting to connect using userid: scott
The test did not succeed.
ORA-12571: TNS:packet writer failure
There may be an error in the fields entered,
or the server may not be ready for a connection.
</snip>
Even though I have the following entry in the listener.log.
<snip>
10-APR-00 16:58:37* (CONNECT_DATA=(SERVICE_NAME=8idb)(CID=(PROGRAM=C:\Program
Files\Oracle\jre\1.1.7\bin\jrew.exe)(HOST=NTclient)(USER=NTuser))) *
(ADDRESS=(PROTOCOL=tcp)(HOST=10.0.0.20)(PORT=2465)) * establish * 8idb * 0
</snip>
Though sqlnet.log is logging the follow
<snip>
Fatal NI connect error 12537, connecting to:
(LOCAL=NO)
VERSION INFORMATION:
TNS for Linux: Version 8.1.5.0.0 - Production
Oracle Bequeath NT Protocol Adapter for Linux: Version 8.1.5.0.0 - Production
TCP/IP NT Protocol Adapter for Linux: Version 8.1.5.0.0 - Production
Time: 10-APR-00 16:58:37
Tracing not turned on.
Tns error struct:
nr err code: 0
ns main err code: 12537
TNS-12537: TNS:connection closed
ns secondary err code: 0
nt main err code: 0
nt secondary err code: 0
nt OS err code: 0
</snip>
The listener.ora is as follows
<snip>
listener=
(description=
(address_list=
(address=(protocol=tcp)(host=10.0.0.10)(port=1521))
sid_list_listener=(sid_list=
(sid_desc=
(global_dbname=8idb)
(sid_name=8idb)
(oracle_home=/home/oracle/product/8.1.5)
</snip>
Clients Tnsnames.ora file
<snip>
# Generated by Oracle Net8 Assistant
8IDB=
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(PORT = 1521)(HOST = 10.0.0.10))
(CONNECT_DATA =
(SERVICE_NAME = 8idb)
</snip>
Any Help would be greatly appreciated
Thanks
Regards
Tom
null

Hi Hasan,
Firstly, please make sure that the software is compatible with the Windows Server 2012. Have you updated this software to the latest version?
Secondly, please check if the software is listening on the proper port. To verify this, please use the command below:
netstat -an
Also, please disable the firewall and try again.
Best regards.
Steven Lee
TechNet Community Support

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