What is causing this issue?

An administrator configured the antivirus profile in a firewall policy set to flow-based inspection mode. While testing the configuration, the administrator noticed that eicar.com test files can be downloaded using HTTPS protocol only.

What is causing this issue?
A . Hardware acceleration is in use.
B . The test file is larger than the oversize limit.
C . HTTPS protocol is not enabled under Inspected Protocols.
D . Full SSL inspection is disabled.

Answer: D

Explanation:

The issue is likely caused by:

D. Full SSL inspection is disabled.

In flow-based inspection mode, if full SSL inspection is disabled, the FortiGate device may not be inspecting the contents of the HTTPS traffic, allowing the eicar.com test files to be downloaded without being scanned for viruses. To address this, you would need to enable full SSL inspection to ensure that the antivirus profile can inspect the contents of encrypted traffic.