Hi hien,
Depending on Firewall model, there might be 1/2 dedicated HA port(s), but you can use any physical port as HA port(s).
But, never use any logical port in HA, like: Software Switch port(s), Hardware Switch port(s), Redundant/Aggregation port(s)...etc.
In FortiGate:
1. Any ports can be data ports.
2. Any HA ports can be data ports.
3. You can convert any dedicated management (OOB > Out-of-Band Management) ports to data ports.
4. Yes, in FGT - You can do the combination of dedicated HA port and regular data port as HA ports.
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Faridul
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