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Sophos Anti-Virus for Windows: error 0x80040F04 after installation

Despite apparently successfully installing, Sophos Anti-Virus for Windows displays a white-cross on a red-circle by the Sophos shield icon in the system tray, and error number 0x80040F04 is found in the Sophos AutoUpdate trace log (ALC-yyyymmdd-hhmmss.log).

This error is found when the server cannot be contacted, and Sophos Anti-Virus cannot update.

What to do

Check the following:

If you need more information or guidance, then please contact technical support.