This is why the concept of running services until different ports than default isn’t a real security measure, it doesn’t actually take any effort to figure out what kind of service is running on a port.
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I ran my ssh behind 53 for a while because it’s rarely blocked. A few bots even got it right and figured out it was ssh.
This is why the concept of running services until different ports than default isn’t a real security measure, it doesn’t actually take any effort to figure out what kind of service is running on a port.