F-secure product shows error notification "Security Cloud Malfunction" on a Mac computer

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Why does the F-Secure product (SAFE / Anti-Virus) show "Security Cloud Malfunction" error notification on my Mac computer?


Issue may be related to a corrupt "hosts" file on the Mac.

First just restart you Mac. If after that the issue is still there, please try resetting the hosts file on the Mac.

How to reset the Hosts file on Mac:

  1. From the Finder, navigate to Go → Go to Folder
  2. Type this in the Go to Folder window: /private/etc/hosts
  3. From the finder window, click and drag the hosts file to the desktop. (we're doing this because we can't open the hosts file directly and edit it)
  4. Double-click the hosts file (on the desktop) and it will open in TextEdit (or any default text editor on your Mac)
  5. Erase everything in it. Copy the following piece of text and paste it into the hosts file
# Host Database
# localhost is used to configure the lookback interface
# when the system is booting. Do not change this entry.
##	     localhost	broadcasthost

::1		    localhost
fe80::1%lo0	 localhost

  1. Save this file
  2. Open Go to Folder window
  3. Open /private/etc/hosts again
  4. Drag the hosts file on desktop back to the /etc/ folder. You will be asked about the existing hosts file
  5. Choose Replace and authenticate with the admin password when asked for it
You can also contact F-Secure customer support chat for remote assistance to reset the hosts file.

As we don't rely on hosts file anymore in currently available versions, a re-installation of the F-Secure product on your Mac computer should also solve the issue. 


Article no: 000002078