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How to install and configure Sophos antivirus

  1. Download Sophos from the following link. Obtain the required username and password to enable the auto-update feature from AITS.
  2. Uninstall any previous version of Sophos that may be on your computer. 
    • Log onto your computer as Administrator, then navigate to the Control Panel. 
    • Double click on "Add and Remove Programs". 
    • Find the Sophos software and uninstall it.'
  3. Reboot your computer. If you are installing Sophos on a computer running Windows, ensure that the "Client for Microsoft Networks" is installed. To check if it is or not:
    • Log onto your computer as Administrator, then navigate to the control panel.
    • Double click on "Network Connections".
    • Right cick on "Local Area Connection" and select "Properties".
    • In the pop-up window, you should find "Client for Microsoft Networks", if not, click "Install" and add the service.
    • You may be asked to reboot your computer.

4. Start the installer program by double clicking the Sophos program you downloaded in Step 1.

  • It is recommended to use the default install directories.

5. During the installation procedure, you will be prompted for an "Update Source". It is important to fill this information accurately. The "Address" is OS dependant and is listed in the table immediately below the figure.  For example, if you are running Windows XP, the address you would use is: "" as shown in the figure.  The "Username" and "Password" are obtained from

  • If you have a proxy server, select the "Access the update source via a proxy server" and follow the instructions


Operating System Address
Windows 2000, XP, 2003 or VISTA
Windows ME, 98 or 95
MacOSX 10.2/10.3 (version 4.9.x)
MacOSX 10.4+ (version 7.0.x)
Linux on intel

6. After the installation has been completed, Sophos will be temporarily unavailable while it contacts the update server to download the latest anti-virus engine and IDEs. When the Sophos icon (the shield at the bottom right corner of your desktop's taskbar) becomes blue, proceed to the next step. If the shield has a red X instead, this means that your machine could not communicate with our server. This could happen if:

  • You are using a Firewall and have NOT given "iupdate.exe" access to the internet
  • You are not connected to your ISP
  • You typed the wrong address  (proceed to step 7)
  • You typed the wrong Username and/or Password (proceed to step 7)

7. Configure Sophos. To do this, first launch the Sophos application from the Start Menu. Click on the Configure Menu.  It is recommended you configure the "On-access scanning" and the "Right-click scanning" options. For more information, please refer to the Sophos user-guides.


8. ENCS has two Sophos update servers. This is to ensure that one server is available at all times. Add the secondary update server, by selecting "Configure" -> "Updating".

  1. If you made a mistake in typing the primary update server address, username or password, correct this first.
  2. Select the "Secondary server" tab, add the correct address and the same username, password combination you obtained earlier. Once again, the table below lists the correct address to use for the secondary server.


Operating System Secondary Server Address
Windows 2000, XP, 2003 or VISTA
Windows ME, 98 or 95
MacOSX 10.2/10.3 (version 4.9.x)
MacOSX 10.4+ (version 7.0.x)
Linux on intel


9. Review the configuration for "On access scanning" and "Right click scanning". Refer to the user guides for more information.


A user-managed managed mailing list has been created. If you want to receive important information on security alerts or patches that can affect your computer, you should subscribe here:  User-Managed Mailing List