FortiGuard updates fail on download (FortiGate)

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Description	FortiGuard updates (push or scheduled) are not always successfully downloaded.
Components	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 http://support.fortinet.com. See also: “The system has entered conserve mode” log message explanation Fine tuning IPS predefined signatures for enhanced system performance

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