Oracle 10gR1 on Win Xp SP1

[tonijel]

what happens when you start it from the command line

C:\>sqlplus /nolog

SQL*Plus: Release 10.1.0.2.0 - Production on ╚et Lis 13 01:56:06 2005

Copyright (c) 1982, 2004, Oracle. All rights reserved.

SQL> conn sys/sistem00@mojabaza as sysdba
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified


SQL> conn /as sysdba
Connected.
SQL> select instance_name from v$instance;

INSTANCE_NAME
----------------
mojabaza

SQL>