nmap -p 22 [hostname] Scans the port to determine if it is open, closed, or filtered. Command Purpose ping [hostname] Confirms basic network reachability and that the host is up.
SSH Refused Connection Diagnostic Checklist
Firewall or Security Group Restrictions Modern security configurations often block inbound traffic by default. Skipping these steps can lead to unnecessary changes on your local machine when the issue resides entirely on the remote end.
Similarly, cloud environments rely on Security Groups or Network Access Control Lists (NACLs); if the rules do not explicitly allow inbound traffic on port 22 from your IP address, the connection will be refused regardless of the SSH service status. This specific output indicates that your client successfully initiated a network connection to the target server but received a reset packet (RST) instead of the expected SSH banner.
SSH Refused Connection Diagnostic Checklist
Common Solutions and Fixes Once the diagnosis is clear, applying the correct fix is usually straightforward. This distinction is crucial for troubleshooting, as it directs your attention to the server's configuration rather than network routing issues.
More About Ssh: connect to host port 22: connection refused
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