All Errors

This error occurs when the SSH client or server specifies an invalid or unsupported Message Authentication Code (MAC) algorithm in its configuration. It typically indicates a typo, deprecated algorithm, or incompatible SSH version.

This error occurs when the SSH server on a remote host unexpectedly closes the connection after accepting the TCP connection but before or immediately after authentication. It usually indicates server-side configuration issues, resource constraints, or authentication failures rather than network problems.

OpenSSH rejects the chroot directory because it has incorrect ownership or permissions. The directory must be owned by root and not writable by group or other users, for security reasons.

SSH automatically generates host keys when the SSH server starts for the first time. This message is normal and expected on new systems or fresh containers, but can be concerning if it happens unexpectedly on an existing server.

SSH local port forwarding fails when the specified local port is already in use by another process. This occurs when establishing tunnels with the -L flag and attempting to bind to a port that another service occupies.

This error occurs when your SSH client cannot establish a connection to the remote server on port 22. It typically indicates the SSH service is not running, the port is blocked by a firewall, or the server is unreachable.

SSH unknown option errors occur when an invalid or mistyped command-line flag is passed to the ssh command. This commonly happens due to typos, using double-dashes instead of single-dashes, or trying to use options that don't exist in your SSH version.

SSH connection fails with 'Permission denied (publickey,keyboard-interactive)' when the server rejects both public key and keyboard-interactive authentication methods. This typically indicates missing keys, incorrect permissions, or server configuration issues.

SSH port forwarding fails when the client cannot bind to a local or remote port. This typically happens when the port is already in use, you lack permissions, or there are conflicting SSH configurations.

SSH fails to connect or initialize when your .ssh/config file contains invalid or misspelled configuration options. This error occurs during SSH parsing and prevents any connections from being established.

SSH throws a 'missing argument' error when a command-line option or config file keyword doesn't have its required value. This typically happens with flags like -p, -i, or -o that expect arguments, or with malformed SSH config files.

The SSH client cannot reach the remote server on port 22 within the timeout period. This typically indicates a firewall blocking the connection, the SSH service not running, or network connectivity problems between your machine and the host.

SSH fails with "Permission denied (keyboard-interactive)" when the server denies authentication attempts using keyboard-interactive methods, often due to authentication method configuration issues, disabled password authentication, or misconfigured authorized_keys.

This error occurs when your SSH client and the remote SSH server cannot agree on a common encryption cipher. Modern SSH clients disable older, weaker ciphers by default for security, causing connections to legacy servers to fail.

This error occurs when SSH detects a mismatch between the host key stored locally and the key presented by the remote server. It typically happens after server reinstallation, key rotation, or network configuration changes. You can fix this by removing the old key from your known_hosts file.

The SSH daemon (sshd) is rejecting incoming connections from a specific hostname or IP address. This typically indicates TCP wrapper restrictions, firewall rules, or service misconfiguration preventing client access.

SSH channel open requests are rejected due to server-side policy restrictions. This commonly occurs when port forwarding is disabled in sshd_config or when tunneling operations are restricted for security reasons.

This error occurs when you try to start the SSH daemon without using its full absolute path. sshd enforces this security requirement to prevent PATH manipulation attacks and to ensure the re-exec mechanism works correctly.

The "template not found" error occurs when Terraform cannot locate a template file referenced in your configuration. This typically happens due to incorrect file paths, missing interpolation syntax, or file location mismatches in CI/CD environments. Fix it by verifying paths use `${path.module}` interpolation and files exist before Terraform runs.

This error occurs when Terraform's tls_private_key resource fails to generate a new private key. It typically happens due to invalid algorithm parameters, insufficient system entropy, or unsupported key configurations.