Oracle XE - Solution to 'cannot access' errors
BY webmaster
11 years ago
44 comments comment
We provide Oracle administration support on GNU Linux Servers. One of our customers had us set up a new Oracle XE server for them on CentOS. We set up everything and had the system up and running fine. We had also tested everything on the server and verified connection status from clients. Two days after installation we got a call from the customer that he could not open the Oracle XE web administration interface and he was getting an access denied, page not found error on

We promptly looked into the issue and checked for any mistakes in configuration or the setup. We scourged the oracle technology forums for an answer to this problem. There were a few solutions that were mentioned on the site. We tried all of them that we found on OTN but could not figure out the problem. The oracle service was running fine but we could not connect to it through the web admin interface.

Some of the solutions mentioned on the site included

a) Reinstalling Oracle XE - we did not want to go this way as we would not learn anything by doing this
b) Reloading settings by running /etc/init.d/oracle-xe force-reload. We did this but didn't change anything
c) We tried the exec dbms_xdb.sethttpport(8080) strategy but it was throwing errors.

On checking lsnrctl status we were getting the following errors
Copyright (c) 1991, 2005, Oracle.  All rights reserved.
TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener
TNS-12541: TNS:no listener
 TNS-12560: TNS:protocol adapter error
  TNS-00511: No listener

We figured that the the listener was not able to start and bind to the port and had something to do with network settings. We checked out /etc/hostname and /etc/hosts and checked with the local ip. What had happened was that the local static IP was changed manually after the Oracle XE installation but the hosts file did not reflect this change. We corrected this error and did a /etc/init.d/oracle-xe force-reload and presto everything was working.

We were no longer getting the "Could not connect to http://localhost:8080/apex, Page not found" error anymore. We verified that the listeners were running by running lsnrctl status which gave us the correct response which should look like below
Alias                     LISTENER
Version                   TNSLSNR for Linux: Version - Production
Start Date                1-DEC-2008 17:22:06
Uptime                    0 days 1 hr. 12 min. 14 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...
Services Summary...
Service "PLSExtProc" has 1 instance(s).
  Instance "PLSExtProc", status UNKNOWN, has 1 handler(s) for this service...
Service "XE" has 1 instance(s).
  Instance "XE", status READY, has 1 handler(s) for this service...
Service "XEXDB" has 1 instance(s).
  Instance "XE", status READY, has 1 handler(s) for this service...
Service "XE_XPT" has 1 instance(s).
  Instance "XE", status READY, has 1 handler(s) for this service...
The command completed successfully

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on 04th April 2007 / by webmaster
Linux is the epitome of the FLOSS model. Technical Solution Linux installation Leave a reply Your email address will not be published. Required fields are marked * Dewey J. Corl (not verified) access_time 01 Dec 2020 - 04:57 Linux is not ready for the general public! (I am a Ubuntu user). For proof, 1. try to simply print labels on a Dymo label printer. It takes a LOT of work to get to the ease of label printing already available in Windows and Mac. 2. try syncing a modern Palm based PDA. Yes, jpilot and others will sync the main data, but pictures and midi files do not get transferred without a lot of extra setup. These are examples of applications that are not ready for the general public. Since an operating system only supports applications, Linux is not ready to be a common desktop for the general public. While we are waiting for the applications to catch up, keep up the good work!! Anoop John (not verified) access_time 01 Dec 2020 - 04:57 Dewey Yes you may be right. But these are not applications that a common man would use. A common man would use one of these applications - Internet browser, Chat Client, Email Client, Document Writer, Presentation Creator, Spreadsheet Editor, Movie Viewer, Music Player, CD/DVD Writer. Both examples you cited are more specific applications that only a small percentage of the whole population uses. It will take time before those hardware vendors identify the need from their perspective to address the Linux community. Krishnadas (not verified) access_time 01 Dec 2020 - 04:57 Dear Mr Anoop, Thank you very much for the free installation of LINUX done in my PC. I am getting immersed in the LINUX and seeing the versatility. To my surprise, I am able to read one of my old backup CD(wherein lot of my valuable file exist) done in DIRECT CD wizard (a custom cd writing software of Easy Cd creator in WIN98) which could not be read in XP. Installation of old version of easycd creator/direct cd program was not possible in XP. I thought that possible i lost all data. Very pleasant start! Srikanth N. S. (not verified) access_time 01 Dec 2020 - 04:57 Hi Anoop, My friend is thrilled with Ubuntu. One of his grouses with windows was that after OS installation, everything else is to be installed separately which is a real headache. WHereas if u install Linux, everything is installed as a package and he is thrilled to bits! Let linux installation spread in Trivandrum and your service in this direction is highly appreciated. Kepp up the good work Regards. PDA Freak (not verified) access_time 01 Dec 2020 - 04:57 Is it possible to install linux on a packardbell notebook ? Pagination Current page 1 Page 2 Next page Next › Last page Last » Add new comment
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Terry (not verified)
access_time 01 Dec 2020 - 08:36

I have the same problem and would like some more information if possible in particular
what is to be changed in the hosts file.

The problem occurred after 2 logons


Please advice if your problem was solved. I am studying SQL, I have installed and reinstalled the DB twice. I managed to login 3 times previously but now I am getting
Error 404: Not Found
File not found on My listeners are open.


nothing yar its so simple, just follow the below step
1)go to oracle shortcut icon and right click on properties
2)click general
3)click on CHANGE button and choose web browser ex:(mozilla,chorome)

Anonymous (not verified)
access_time 01 Dec 2020 - 08:36

Getting same error but only on Windows XP

In Firefox, it says could not connect..