Client Machine: Windows 2000 Oracle 8.1.5
Server : Windows 2000 Oracle 8.17

Tnsping from client to Server is fine but SQLPLUS connection fails.
Please help/suggest a solution.

The only port open is 1521
------------
TNSNAMES.ora entry on client:

DB =
(DESCRIPTION =
(ADDRESS_LIST =
(ADDRESS = (PROTOCOL = TCP)(HOST = IP_ADDRESS)(PORT = 1521))
)
(CONNECT_DATA =
(SERVICE_NAME = DB.DOMAIN)
)
)

--------
TNS Ping Utility for 32-bit Windows: Version 8.1.5.0.0 - Production on 07-DEC-05 09:48:21

(c) Copyright 1997 Oracle Corporation. All rights reserved.

Attempting to contact (ADDRESS=(PROTOCOL=TCP)(HOST=IP_ADDRESS)(PORT=1521))
OK (10 msec)
----------

SQL*Plus: Release 8.1.5.0.0 - Production on Wed Dec 7 10:07:08 2005

(c) Copyright 1999 Oracle Corporation. All rights reserved.

SQL> conn user/pwd@aspfizer
ERROR:
ORA-12535: TNSperation timed out

Thanks
-D