Do these 3 things before closing this tab:
1Fix the driver behind crashes, sound loss and screen glitches2Clear out junk files and repair common Windows errors3Scan for outdated or missing drivers - takes under a minuteIf SSH and the out-of-band console both fail, first separate a network-path problem from an SSH-service problem and an authentication problem. Confirm that the virtual machine is running and healthy, identify the exact error, test port 22, and then use an alternate management channel—such as a session agent, instance-connect feature, serial console, or rescue system—to repair the host. A running VM alone does not prove that its network path or sshd service is working.
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Start with the machine, address and credentials
Do not change firewall rules or replace keys until you have confirmed that you are connecting to the intended machine. A surprising number of failed SSH attempts target an old public address, the wrong virtual machine, or the wrong operating-system account.
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- Check the instance state and provider health checks. Verify that the VM is powered on and that all available platform or instance status checks have passed. A failed system or instance check can indicate a host, boot, storage or network problem that SSH troubleshooting cannot fix.
- Confirm the current endpoint. Recheck the public DNS name or IP address in the provider console. Dynamic addresses can change after a stop and start. If the name resolves to more than one address, check that you are testing the current record.
- Use the distribution’s actual login name. Cloud images commonly disable direct root login and use an image-specific account. The username for one Linux distribution is not necessarily valid for another, even when both use OpenSSH.
- Select the matching private key. The private key must correspond to a public key in the account’s
authorized_keysfile. A key created for another VM will not authenticate here. - Check private-key permissions. On a Unix-like client, restrict the file so that other users cannot read it, for example with
chmod 400 key_pair.pemor the permission mode required by your SSH client. An overly permissive key can be rejected before the server evaluates it.
These are general connection prerequisites identified in Amazon Web Services’ EC2 guidance. The exact labels and checks differ on other hosting platforms, but the sequence is portable.
Read the error as a layer diagnosis
The wording of the failure determines which layer to inspect first. Do not treat a timeout, refusal and authentication failure as interchangeable.
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| Client message or symptom | What it usually proves | First checks |
|---|---|---|
Connection timed out |
No response came back through the destination path before the client timeout. | Address and DNS, route, security group, network ACL, provider firewall, local firewall, host firewall and reachability of port 22. |
Connection refused |
The host was reached, but no service accepted the TCP connection on that port, or the host actively rejected it. | Whether sshd is running, which port it listens on, port conflicts and host-firewall rules. |
Permission denied or Server refused our key |
Network communication reached SSH, but authentication was rejected. | Username, private-key match, authorized_keys, account status and key-file permissions. |
| Blank, frozen or unavailable console | The console channel may be unavailable, or the machine may have a boot, kernel, display or serial-output problem. | Provider console status, serial output, boot logs and a recovery path; capture diagnostics before rebooting. |
As AWS re:Post explains, a server that does not respond causes the client to time out; a refusal is different because the destination was reached without an accepting SSH service. That distinction prevents you from spending an hour editing sshd_config when a security-group rule is dropping every packet—or opening a firewall when sshd simply failed to start.
Collect evidence from the client
Test whether TCP port 22 is reachable
From a permitted client network, run:
nc -zv HOST 22Replace HOST with the same DNS name or IP used by SSH. A successful connection shows that a TCP path to port 22 exists; it does not prove that authentication will succeed. A timeout points back to addressing, routing or filtering. A refusal points toward the host’s listener or firewall. If netcat is unavailable, use an equivalent approved TCP-port test for your operating system.
Run SSH in verbose mode
ssh -i key_pair.pem user@HOST -vvvThe debug stream shows where the attempt stops: name resolution, TCP connection, host-key negotiation, user authentication or session setup. Preserve the output when escalating. It can reveal that the client is offering a different key than the one you intended, resolving the name to an unexpected address, or reaching a different SSH port.
Do not publish private keys or sensitive tokens from a debug log. Host names, usernames and public host-key fingerprints may also be sensitive in a production environment.
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Choose an alternate management path
When SSH is down, use a channel that does not depend on the same failure. AWS documents several options for EC2 Linux; comparable features exist under different names elsewhere. Availability depends on the account, image, region, operating system and provider configuration.
| Recovery path | Needs TCP port 22? | Typical prerequisites | Works when | What it permits |
|---|---|---|---|---|
| Session Manager-style agent session | No | A preinstalled and running management agent, suitable identity permissions and outbound connectivity as required by the provider. | SSH is broken but the OS and management agent can still run. | An audited interactive shell and, depending on the service, command execution and file repair. |
| Instance-connect-style temporary SSH access | Usually yes | Supported image and network path, plus the required identity permissions. | Normal key or account configuration is wrong but the SSH daemon and port remain reachable. | Short-lived access that can repair users, keys or configuration. |
| Serial console | No | Provider and account support, permission to open the serial channel and a compatible guest configuration. | Network configuration, firewall rules or early boot problems prevent normal SSH. | Low-level console access for boot and service repair. |
| Rescue instance or offline disk attachment | No for the affected guest | Permission to stop or detach the affected disk and attach it to a helper system. | The guest will not boot or no in-guest management channel works. | Offline log inspection and file repair; it does not provide a normal live session on the broken guest. |
AWS re:Post’s practical advice is to use another connection method when one fails. Choose the path that avoids the suspected layer: a serial or offline method is more useful than another network-based method when routing or boot is broken.
Repair SSH from an alternate shell
Once you obtain a session, make one change at a time and retain the command output. The following commands assume a systemd-based Linux host and a service named sshd; some distributions use ssh instead.
1. Check the service state and recent logs
sudo systemctl status sshd
sudo journalctl -u sshd --no-pager -n 50Look for syntax errors, missing host keys, permission failures, unavailable libraries, port-binding errors and repeated authentication or crash messages. If systemctl reports that the unit is named ssh.service, substitute that unit name in both commands.
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2. Validate configuration before restarting
sudo sshd -tNo output normally means the configuration parsed successfully. An error identifies the file and line that must be corrected. Do not restart a daemon after editing its configuration until this test passes; a malformed configuration can turn a recoverable session into a complete lockout.
3. Check whether anything is listening on the expected port
sudo ss -tlnp | grep :22If there is no listener, inspect the service state and its configured Port values. If another process owns port 22, identify it before stopping anything. If SSH intentionally uses a different port, test that port in the provider firewall, host firewall and client command rather than assuming port 22.
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sudo ssh-keygen -AThis regenerates host keys that are absent from their expected locations. Confirm ownership and restrictive permissions afterward. Regenerating keys changes the server identity presented to clients, so record the change and update trusted fingerprints through your normal operational process.
5. Correct user-key and configuration permissions
For key authentication, inspect the target account’s home directory, its .ssh directory and authorized_keys. The account must be able to traverse the directory and read the key file, while the files should not be writable by unrelated users. Also check that the account is not locked or expired and that an SSH configuration rule is not disabling public-key authentication for that user.
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Use the distribution’s package manager to reinstall the OpenSSH server package only when logs show missing or damaged dependencies. Reinstallation is not a substitute for diagnosing a firewall, wrong port or wrong username.
6. Restart and immediately verify
sudo systemctl restart sshd
sudo systemctl status sshdKeep the alternate session open while testing a new SSH connection from a separate terminal. If the restart fails, return to journalctl and sshd -t rather than repeatedly restarting.
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Fix network filtering after the service is healthy
If sshd is running and listening but the client still times out, trace the packet path outward. Check the provider security group or equivalent virtual firewall, network ACL, route table, public-address association and any host firewall such as nftables, iptables or ufw. Confirm that the source address from which you are connecting is allowed; a rule limited to an old office or home IP can appear to fail suddenly after an ISP change.
Make the narrowest temporary rule needed to restore administration, then replace it with the intended restricted rule. Avoid opening SSH to every Internet address as a permanent fix. If your provider has separate controls for IPv4 and IPv6, verify that the client is not resolving an IPv6 address whose firewall policy differs from IPv4.
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When the console is blank or the VM will not boot
A blank console does not automatically mean that the operating system is dead. The guest may be booting without graphics output, writing logs to a different console, waiting for a filesystem check, or failing before the login service starts. Use the provider’s serial channel if available and save visible diagnostics before a reboot.
If no interactive channel works, follow the provider’s documented rescue or disk-attachment workflow. Attach the affected volume to a helper system in a way that preserves the original data, mount it read-only first when practical, and copy logs and configuration files before editing. Inspect boot, kernel, filesystem and SSH logs; correct a broken configuration or disabled service; then safely unmount and reattach the disk. AWS specifically describes a rescue instance for inspecting logs when normal connection restoration fails.
Offline repair is provider- and filesystem-specific. Device names, encryption keys, boot loaders, SELinux or AppArmor policies and mount commands must match the actual operating system. If the volume is encrypted, ensure that the recovery process preserves access to its key material.
Common mistakes that prolong an outage
- Assuming “running” means reachable. Platform status, network reachability and the SSH service are separate tests.
- Changing several layers at once. Replacing keys, opening all firewall ports and editing
sshd_configtogether destroys the evidence needed to identify the cause. - Using the wrong account. A valid private key still produces an authentication failure when paired with the wrong distribution username.
- Ignoring the configured port. A daemon can be healthy on a nonstandard port while port 22 correctly refuses or times out.
- Rebooting before collecting logs. A reboot may erase useful transient output and can worsen an already damaged filesystem.
- Closing the only working recovery session. Keep the alternate channel open until a fresh SSH login succeeds.
Prevent the next lockout
- Maintain at least one tested alternate management path, and verify its permissions before an incident.
- Store the correct image username, endpoint discovery procedure and key-rotation process in your runbook.
- Validate SSH configuration with
sshd -tbefore deploying changes. - Monitor the SSH service, host reachability and provider health checks as separate signals.
- Restrict administrative access by source network, use short-lived credentials where supported and retain an audited recovery path.
- Test rescue and disk-attachment procedures on a nonproduction VM so that an emergency does not become the first time anyone performs them.
- Record host-key changes and preserve logs when repairing a machine, especially if the server hosts a multiplayer game or other stateful service.
The fastest safe recovery is therefore a decision tree: verify the machine and endpoint, classify the error, gather client evidence, bypass the failed layer with an alternate channel, validate and repair the SSH service, then correct filtering. If every channel fails, preserve the disk and use the provider’s offline rescue method rather than guessing at live changes.
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