I have changed the hostname of my linux box and now get the following error when running lsnrctrl start. TNS-12537: TNS:connection closed TNS-12560: TNS:protocol adapter error TNS-00507: Connection closed Linux Error: 29: Illegal seek I changed the references to the hostname in the listener.ora and tnsnames.ora, but I kept the references to GLOBAL_DBNAME unchanged. Do I need to change my instances GLOBAL DBNAME? John Dunn