Home » Categories » Multiple Categories

Web Browser Reports 330 Error Content Encoding

Problem Description

In rare circumstances you may come across the following error in your web browser when accessing one of the Nagios products:

Content Encoding Error

The page you are trying to view cannot be shown because it uses an invalid or unsupported form of compression.

* Please contact the website owners to inform them of this problem.

Error 330 (net::ERR_CONTENT_DECODING_FAILED): Unknown error.




The Apache web server requires zlib.output_compression to be configured to On in the /etc/php.ini file.

Execute the following command to open the file in vi:

vi /etc/php.ini

When using the vi editor, to make changes press i on the keyboard first to enter insert mode. Press Esc to exit insert mode.


To locate the line zlib.output_compression = type the following:

/output_compression =


This should take you directly to the line. Change the setting to On:

zlib.output_compression = On


When you have finished, save the changes in vi by typing:


and press Enter.


The last step is to restart the Apache service using one of the commands below:

RHEL 6 | CentOS 6 | Oracle Linux 6

service httpd restart


RHEL 7 | CentOS 7 | Oracle Linux 7

systemctl restart httpd.service


Ubuntu 14

service apache2 restart


Debian | Ubuntu 16/18

systemctl restart apache2.service



After the service has restarted the problem should no longer occur.



Final Thoughts

For any support related questions please visit the Nagios Support Forums at:


0 (0)
Article Rating (No Votes)
Rate this article
  • Icon PDFExport to PDF
  • Icon MS-WordExport to MS Word
Attachments Attachments
There are no attachments for this article.
Related Articles RSS Feed
Nagios XI - Configuration Applies, No Changes Take Place
Viewed 1883 times since Tue, Jan 27, 2015
ERROR: Please add the ’Optional’ channel to your Red Hat systems subscriptions
Viewed 7373 times since Tue, Jan 26, 2016
Nagios Incident Manager - Cannot Create User With A Period (.) In Username Field
Viewed 282 times since Thu, Jan 21, 2016
NDOUtils - Message Queue Exceeded
Viewed 5292 times since Thu, Jan 21, 2016
Nagios XI - Resetting The nagiosadmin Password
Viewed 16189 times since Mon, Jan 25, 2016
Nagios Fusion - Multi-Tenancy
Viewed 919 times since Thu, Jan 21, 2016
Nagios XI - Installing XI Fails To Install Dependency pymssql
Viewed 1772 times since Mon, Oct 17, 2016
Nagios XI - Can’t Log Into The Web Interface
Viewed 21894 times since Tue, Jan 27, 2015
Nagios Log Server - Administration Page Fails To Display
Viewed 1763 times since Thu, Jan 21, 2016
Nagios XI - Scheduled Downtime Not Working
Viewed 1841 times since Mon, Oct 10, 2016