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Running ssh on 443 doesn't do anything unfortunately. A proper port scan will still detect such a common protocol.
It's more about gaining access from inside a network that doesn't allow outbound on 22. For the web to work it would need 443 so connecting out on 443 might work
Sure, just don't mistake port switching for actual security.
I think you may be still missing the point because it was never implied that the port change is for security; the security is in disabling password authentication and only accepting key based authentication. The reason I put it on 443 is because it is a port that is usually allowed by firewalls and doesn't get as much attention. So if I am on a network that is blocking access for standard VPN or SSH ports then it might just be enough for me to bypass it. And it's traffic on a port that is going to see a lot of other encrypted traffic going across it, so it looks more natural then just popping some other random ports that could potentially raise an alarm.
I'm not missing any point. It should be clear to people who don't understand security that running a protocol on a different port doesn't mean shit for safety. "Because it doesn't get as much attention" wouldn't mean anything to any enterprise firewall the moment it's not an http header.
Absolutely. Though putting it on 443, which is regularly port scanned as well, is the opposite of security through obscurity.