OMS Sql script job returns ORA-01033 (database is up and running)

Hello,
I am running into an error when I try to run a SQL script from the OEM 10.2.0.5 against a Oracle Database 9.2.0.1.
The error I get is

ERROR:
ORA-01033: ORACLE initialization or shutdown in progress


Usage: { EXIT | QUIT }	[ SUCCESS | FAILURE | WARNING | n |
       <variable> | :<bindvariable> ]  [ COMMIT | ROLLBACK ]

Error from SQLPLUS: 1

The database is up and running, applications and sessions are able to log in and do DML/DDL without problem.
Do anybody have an idea how I can check if the OMS or agent are pointing to the wrong instance?

thanks,

Daniel