tnsnames not working. tnsping picks sqlnet.ora

Hi all
My oracle client has been working fine till today. I tried to connect
to a new database, after editing the tnsmaes and adding the entry for
that new connection, TOAD begun to answer a strange and empty dialog.
I triend to tnsping the new database and any other old database and I
always got the message:

C:\oracle\ora92\bin>tnsping mqsitmp_pr

TNS Ping Utility for 32-bit Windows: Version 9.2.0.1.0 - Production on
28-JUN-20
07 11:47:03

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

Archivos de parßmetros utilizados:
C:\oracle\ora92\network\admin\sqlnet.ora

TNS-03505: Fallo al resolver el nombre

The client is in Spanish locale, but it says that used file is
sqlnet.ora ¿instead tnsnames.ora?

Where could be the problem. Anyone can point where to look?

Thanks in advance.
-
Nacho

.

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