FortiGate Next Generation Firewall utilizes purpose-built security processors and threat intelligence security services from FortiGuard labs to deliver top-rated protection and high performance, including encrypted traffic.
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DescriptionFortiGuard updates (push or scheduled) are not always successfully downloaded.
  • All FortiGate units with FortiGuard Anti-Virus and IPS updates.
Steps or Commands

You may notice in the event log, entries indicating that the FortiGuard updates were not successful.

The reason of the failure is there is not enough free memory to perform the updates at that very moment, especially if there is heavy traffic, or users are download big files.

To avoid these situations, you can do the following:

  • Disable unused services and IPS signatures to free up memory.
  • Schedule Anti-Virus and IPS updates for off-peak hours such as late evening/early morning or on weekends.

You can also downgrade to FortiOS version 3.0 MR2. You can download newer firmware images from

See also:

  • “The system has entered conserve mode” log message explanation
  • Fine tuning IPS predefined signatures for enhanced system performance

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“The system has entered conserve mode” FortiGate log message explanation