Does moving SSH to a non-standard port help?

A little against noise, and not at all against a targeted attacker. Automated scanners that only try port 22 will miss it, so logs get quieter and fewer guessing attempts arrive. But a full port scan finds an SSH server on any port, because SSH announces itself in its first message, and anyone looking for your server in particular will run that scan. So treat a port change as housekeeping, not protection, and keep the measures that matter: key-based logins only, no password or root logins, an up-to-date OpenSSH, and access limited by source address or through a VPN or bastion host. Document the port so that colleagues and your own monitoring do not mistake it for something unknown. NetSenX sees connections to monitored hosts on any port and flags scanning, repeated login attempts and unusual sessions, on every plan.

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