Quick answer
How to monitor TCP port 22 for SSH availability without installing an agent, and what a successful or failed socket check can actually prove.
Why monitor SSH?
SSH is often the recovery path when a server is unhealthy. Monitoring the SSH service can tell you when remote administration becomes unavailable before the incident expands.
TCP monitoring instead of login automation
A simple port check does not attempt to authenticate. It only verifies that the host accepts a TCP connection on the configured port. That keeps the monitor focused on service reachability.
What a failure can mean
A failed connection may indicate a stopped SSH daemon, firewall change, host outage, routing problem, or a server that is overloaded enough to stop accepting connections promptly.
Security reminder
Do not interpret an open SSH port as proof of security. Port monitoring and security hardening solve different problems. Keep SSH protected with strong authentication, least privilege, network controls, and up-to-date software.
Sources and references
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