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Read ssh -vvv output in order and find the first stage that fails: local configuration, network connection, host-key verification, user authentication, or session setup. A line such as identity file ... type -1 describes one candidate path, not every key available to the client; an offered public key is not proof that the server accepted it.
What ssh -vvv tells you
OpenSSH accepts repeated -v options to show progress and help diagnose connection, authentication, and configuration problems. Three repetitions request the most detailed of the ordinary three verbosity levels. The log is a client-side account of what the client tried and what responses it received—not a complete explanation of the server’s configuration or reasoning. Wording and detail can vary by OpenSSH release, platform, configuration, and connection path. See the OpenSSH ssh manual and client configuration manual.
Use the output chronologically. If the connection never reaches authentication, later authentication lines will be absent; changing keys will not fix a failure that occurs earlier.
Read the log by stage
1. Local configuration and identity selection
At the beginning, identify the destination, username, port, proxy or jump path, and identity sources the client is using. Look for configuration and identity-file messages, and note whether an SSH agent or other configured authentication mechanism may be involved. The -i option selects an identity file; OpenSSH also allows a public-key file to identify a matching private key held by ssh-agent. A missing default key path therefore does not establish that no usable identity is available. (OpenSSH ssh manual.)
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2. Network connection and SSH version exchange
Connecting to ... port ... shows the client attempting a connection. Connection established. indicates that the transport connection was made, but says nothing about whether authentication will succeed. Check that the address and port are the intended ones. If the log stops before the SSH version exchange, the problem is earlier than authentication—potentially the route, port, firewall, proxy, or server listener. The client log may not distinguish among those causes.
3. Key exchange and host identity
After connecting, the client negotiates transport parameters and checks the server’s host key. A host-key warning or mismatch is a trust and server-identity issue, not a verdict on whether your account may log in. Do not bypass host-key verification as a routine fix; establish whether the server identity changed legitimately before proceeding.
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4. User authentication
Once host verification is past, follow the authentication exchange. Compare the identities or methods the client tries with the server responses, then locate the final success or rejection. Depending on client and server configuration, authentication can involve public keys, passwords, keyboard-interactive prompts, or other mechanisms; the log’s available methods are specific to that exchange.
5. Session and channel setup
If the log says authentication succeeded but a shell, remote command, SFTP subsystem, or forwarding operation fails, investigate session or channel setup rather than repeatedly changing credentials. OpenSSH supports command execution, subsystem invocation, and transport-only sessions. (OpenSSH ssh manual.)
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Debug lines that answer common questions
| Log line | What it establishes | What to check next |
|---|---|---|
Connecting to ... port ... or Connection established. |
The client is attempting or has made a network connection. | Confirm the destination and port. Continue to the version exchange and later stages; neither line means authentication succeeded. |
identity file ... type ... |
How the client handled that particular candidate identity path. | Check whether that path exists and whether another configured identity or agent key is in use. |
Offering ... public key: ... |
The client is offering the named public key. | Look for the server’s response and the eventual authentication result. An offer alone does not mean acceptance. |
Authentications that can continue: ... |
The server has reported method names that may productively continue this authentication exchange. | Read the list as authentication method names, not key filenames or an explanation of why a key was rejected. |
Next authentication method: ... |
The client is moving on to try a method. | Follow the subsequent exchange to see whether that method succeeds. |
Authenticated to ... or Permission denied (...) |
Whether the authentication stage succeeded or was rejected. | If rejected, review the offered credentials and server-side authorization/configuration. If successful, move to session or channel messages. |
What type -1 and an offered key mean
identity file ... type -1
This line is about the identity path named on that line; it is not proof that every possible key source is unavailable. In GitHub’s published troubleshooting example, type -1 accompanies absent identity files. Other configured identities or an agent key may still be relevant. See GitHub’s SSH public-key troubleshooting example.
Offering ... public key
An offer means the client presented that key during authentication. It does not mean the server accepted it or authorized the account. Find the response after the offer and the final authentication status. GitHub’s example distinguishes absent identity-file paths from output that shows a public key being offered (GitHub SSH troubleshooting).
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Authentications that can continue
This message reports which authentication method names may continue the dialogue. RFC 4252, section 5, defines the field as a comma-separated list of method names that may productively continue authentication; it does not identify a particular failed key or explain the server’s policy. (RFC 4252, section 5.)
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Find the first failure and choose the next check
- Stop at the earliest missing milestone. Determine whether the client selected the expected target, connected, exchanged SSH version information, verified the host key, reached authentication, and then opened the requested session or channel.
- If the failure is before connection or version exchange, verify the destination, port, proxy or jump configuration, and whether the server is reachable and listening. Treat the debug output as evidence of where progress stopped, not proof of one particular network cause.
- If host verification fails, confirm the server’s identity and investigate any legitimate host-key change. Keep host verification enabled unless you have independently established a safe, justified reason to change it.
- If authentication is rejected, identify what the client actually offered, which methods the server said could continue, and the final response. Where available, compare those details with server-side authentication and authorization logs; the client log alone may not reveal the server’s policy.
- If authentication succeeds, focus on the requested command, shell, subsystem, or forwarding channel and its server-side permissions rather than cycling through keys.
Share useful diagnostics safely
When asking for help, retain the OpenSSH version banner and enough surrounding lines to show the transition into the failure. Include relevant client configuration details and, if you administer the server, matching server logs. Before posting publicly, redact usernames, hostnames, filesystem paths, key fingerprints, and network addresses. Exact lines can differ across client versions and connection setups, so avoid treating one isolated message as a universal diagnosis.
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