It seems to me that you have problem with Oracle itself. rsystem01.dbf is database file, where SYSTEM tablespace located (this is only assumption for it's up to administrator who added this file). After connecting Sql*Plus tries to check system.user_profile to know if you're not prohibited to run this product and fails. So, contact the administrator...<br>Another less probable cause may be found in glogi.sql which started after connect.<br>Hope this helps.