you cannot change the default port for SSH for hsphere because you're going to need to change it in all script and some are compiled so you can't do it.
And if the CP can't talk to other machine its all your setup that going to stop working.
Anyway with "without-password" the guy need to have access to your machine first to generate a key to put it on his machine to after that login. Even with this option you can't log with the root password directly.
If you concern about security about your SSH, your best choice here is to add Firewall to limit access to SSH to have 1 machine behind is to accept SSH.
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