Sometimes things are simple. I was having troubles to install Oracle XE on a SLES 11 Box. The Lister would start. But not the Web Interface (http://localhost:8080/apex) Since my Oracle knowledge is limited I was stuck. Only [this][] Post gave me a hint where to look oracle@ivml2114:~/app/oracle/product/10.2.0>./server/bin/oracle_env.sh oracle@ivml2114:~/app/oracle/product/10.2.0> lsnrctl start LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 23-AUG-2010 11:29:42Copyright (c) 1991, 2005, Oracle. All rights reserved.TNS-01106: Listener using listener name LISTENER has already been startedoracle@ivml2114:~/app/oracle/product/10.2.0> sqlplus /nolog SQL*Plus: Release 10.2.0.1.0 - Production on Mon Aug 23 11:30:00 2010Copyright (c) 1982, 2005, Oracle. All rights reserved.SQL> connect sys/ as sysdbaoracleXE: error while loading shared libraries: libaio.so.1: cannot open shared object file: No such file or directoryERROR: ORA-12547: TNS:lost contact Bingo! This is a 64 Bit System. Oracle Xe is 32 Bit. Argh. I did check for the dependencie mentioned in the Oracle docu. But of course missed this. #zypper in libaio-32bit To be sure I then re-installed Oracle XE. And you know what? It Works!