This article applies to 123-reg servers running Plesk.
This article will explain how you can switch off Perl Support using Plesk 11.
Login to your Parallels Plesk Panel.
Click on the Domains link on the left panel.
Click on the Open in Control Panel link for the relevant domain name.
Click on the Website & Domains tab.
Click on the Show Advanced Operations option at the bottom of the page.
Click on the Website Scripting and Security icon.
Under the Web Scripting and Statistics section un-select the option for Perl Support.
Click on the OK to save the change.