Comprehensive and Detailed Explanation From Exact Extract documents and Knowledge:
By default, FortiGate ' s SSL/SSH Inspection profile is configured to recognize and inspect HTTPS traffic on the standard port 443. To inspect HTTPS traffic on a non-standard port , such as 8443 , the administrator must modify the protocol-to-port mapping within the security profile.
In the SSL/SSH Inspection configuration (accessible via Policy & Objects > Security Profiles), there is a section for " HTTPS " where additional ports can be specified. By adding 8443 to this list alongside 443, the FortiGate ' s inspection engine (IPS and UTM) is instructed to apply SSL decryption and analysis to any traffic using port 8443 as if it were standard HTTPS traffic. Without this mapping, the firewall would treat the traffic as an unknown encrypted protocol and would not be able to perform deep content analysis.

According to the FortiOS 7.6 Infrastructure study guide and High Availability (HA) documentation, FortiGate units in an HA cluster use a virtual MAC address to ensure seamless failover. The structure of this virtual MAC address is strictly defined by the Fortinet HA protocol.
For a standard HA cluster, the virtual MAC address format is 00:09:0f:09: < group-id_hex > : < vcluster_port_hex > . However, when VDOMs are enabled, the virtual MAC address prefix changes to e0:23:
ff to accommodate the additional complexity of multiple virtual domains. Therefore, the prefix e0:23:ff in the suspicious MAC address e0:23:ff:fc:00:86 confirms that the packet originated from a cluster with VDOMs enabled (Option A).
Regarding the interface identification, the last byte (86) is calculated as follows:
The 0x80 bit indicates virtual-cluster 2 (vcluster 2). Since $0x86 = 0x80 + 0x06$, we know the packet is from vcluster 2.
The remaining value 0x06 represents the interface index. In FortiOS, the index starts at 0 (port1 = 0, port2 =
1, port3 = 2, port4 = 3, port5 = 4, port6 = 5, port7 = 6). Therefore, the index 6 corresponds exactly to port 7 (Option D).
The fourth byte (fc) represents the HA Group ID (252 in decimal). While this is indeed lower than 255, the specific logic of the virtual MAC composition in a VDOM-enabled environment points specifically to the port identification and vcluster status as the primary diagnostic conclusions.

Comprehensive and Detailed Explanation From Exact Extract documents and Knowledge:
The TCP Maximum Segment Size (MSS) defines the largest payload (the data portion of the segment, excluding TCP and IP headers) that a device can receive in a single TCP segment.
When you configure tcp-mss-sender and tcp-mss-receiver on a FortiGate interface or tunnel, the FortiGate intercepts the TCP 3-way handshake (SYN and SYN-ACK packets). It modifies the MSS value announced by the hosts to ensure that the resulting segments, once encapsulated (e.g., by IPsec or VXLAN), do not exceed the MTU of the path. By reducing the allowed payload size at the source, FortiGate prevents the need for fragmentation further down the line, which improves overall network efficiency and prevents packet loss in " MTU-tight " environments.

Use metadata variables to dynamically assign values according to each FortiGate device:
Metadata variables in FortiManager allow device-specific configurations to be dynamically assigned without manually configuring each FortiGate. This is especially useful when deploying multiple devices with similar base configurations.
Use provisioning templates and install configuration settings at the device layer:
Provisioning templates in FortiManager provide a structured way to configure FortiGate devices. These templates can define interfaces, policies, and settings, ensuring that each device is correctly configured upon deployment.
Add FortiGate devices on FortiManager as model devices, and use ZTP or LTP to connect to FortiGate devices:
Zero-Touch Provisioning (ZTP) and Local Touch Provisioning (LTP) help automate the deployment of FortiGate devices. By adding devices as model devices in FortiManager, configurations can be pushed automatically when devices connect for the first time, reducing manual effort.

From the OSPF status output, the key information is:
# " This router is an ASBR " # This means the FortiGate is acting as an Autonomous System Boundary Router (ASBR).
# An ASBR is responsible for injecting external routing information into OSPF from another routing protocol (such as BGP, static routes, or connected networks).