Unable to connect after installation

Question

Hello,
I just installed Oracle XE 10.2 on CentOS 4 remote server and I am having a really hard time to solve my problem.
I can not go to Database Home page: 127.0.0.1:58080/apex (note I change the port)
My oracle-xe details are:
[root@server /]# /etc/rc.d/init.d/oracle-xe status
LSNRCTL for Linux: Version 10.2.0.1.0 - Production on 30-OCT-2007 03:11:10
Copyright (c) 1991, 2005, Oracle. All rights reserved.
Connecting to (DESCRIPTION=(ADDRESS=(PROTOCOL=IPC)(KEY=EXTPROC_FOR_XE)))
STATUS of the LISTENER
Alias LISTENER
Version TNSLSNR for Linux: Version 10.2.0.1.0 - Production
Start Date 30-OCT-2007 03:06:08
Uptime 0 days 0 hr. 5 min. 2 sec
Trace Level off
Security ON: Local OS Authentication
SNMP OFF
Default Service XE
Listener Parameter File /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/network/admin/listener.ora
Listener Log File /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/network/log/listener.log
Listening Endpoints Summary...
(DESCRIPTION=(ADDRESS=(PROTOCOL=ipc)(KEY=EXTPROC_FOR_XE)))
(DESCRIPTION=(ADDRESS=(PROTOCOL=tcp)(HOST=server.mydomain.com)(PORT=1521)))
Services Summary...
Service "PLSExtProc" has 1 instance(s).
Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
The command completed successfully
When trying sqlplus / as sysdba I get:
[root@server /]# sqlplus / as sysdba
SQL*Plus: Release 10.2.0.1.0 - Production on Tue Oct 30 03:16:47 2007
Copyright (c) 1982, 2005, Oracle. All rights reserved.
ERROR:
ORA-01031: insufficient privileges
Enter user-name: sysdba
Enter password:
ERROR:
ORA-12154: TNS:could not resolve the connect identifier specified
The only way to go inside sqlplus is by doing: sqlplus /nolog
But then when I try to create a table (for example) I get:
SP2-0640: Not connected
For you info:
[root@server /]# echo $ORACLE_HOME
/usr/lib/oracle/xe/app/oracle/product/10.2.0/server
[root@server /]# echo $ORACLE_SID
XE
All this operations are don with user 'root' which is the one who performed oracle installtion.
Please help me.
Many thnaks.

Answer 1

Thanks for answering.
This is the result of the commands:
[root@server /]# ps aux | grep oracle
oracle 16241 0.0 0.5 21608 5640 ? Ss 03:45 0:00 /usr/lib/oracle/xe/app/oracle/product/10.2.0/server/bin/tnslsnr LISTENER -inherit
root 9415 0.0 0.0 1584 472 pts/0 R+ 09:52 0:00 grep oracle
[root@server /]# /sbin/service oracle-xe enable
[root@server /]# /sbin/service oracle-xe start
Starting Oracle Database 10g Express Edition Instance.
[root@server /]# /sbin/service oracle-xe stop
Shutting down Oracle Database 10g Express Edition Instance.
Stopping Oracle Net Listener.
[root@server /]# /sbin/service oracle-xe disable
[root@server /]#
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