All Errors

SSH connection fails when GSSAPI authentication methods are attempted but credentials cannot be verified. This occurs when public key or GSSAPI-based authentication is misconfigured on either the client or server side.

SSH client and server cannot agree on an encryption algorithm. This occurs when connecting newer SSH clients to legacy servers, or when ciphers are disabled for security reasons.

This error occurs when the SSH server closes the connection before the key exchange process completes. It's typically caused by server-side restrictions, resource limits, IP blocking, or SSH daemon issues.

This error occurs when your SSH private key has overly permissive file permissions. SSH refuses to use the key for security reasons, requiring file access restricted to your user only to prevent unauthorized access to your private key.

The "no such identity" error occurs when SSH cannot find the private key file specified in your SSH configuration or command. This typically happens when the key file doesn't exist, has been moved, or the path is incorrect. Resolving this requires verifying the key file exists and fixing its path.

This error occurs when you try to use an SSH key through ssh-add or during git operations, but the SSH agent is not running or the SSH_AUTH_SOCK environment variable is not set correctly. The SSH agent is responsible for managing your SSH keys and providing them to SSH clients when needed.

This error occurs when OpenSSH cannot load or parse a public key file due to format incompatibility or corruption. It typically indicates the key file is in an unsupported format (PuTTY format, malformed, or outdated OpenSSH version) or corrupted with extraneous characters or line breaks.

This error occurs when SSH tools like ssh-add try to communicate with the SSH agent, but the SSH_AUTH_SOCK environment variable points to a nonexistent or inaccessible socket file. It typically means the SSH agent isn't running or the socket path is misconfigured.

The "This private key will be ignored" warning appears when your SSH private key file has permissions that are too permissive. SSH is strict about key file security and will refuse to use keys that are readable by other users. Fixing this requires restricting the file permissions to be readable only by the owner.

SSH refuses to use private key files with overly permissive permissions (0644, 0755, etc). Private keys must be restricted to the owner only (mode 600 or 400) for security.

SSH shows this warning when the remote host's key fingerprint has changed or doesn't match your stored record. This is a critical security alert that requires verification before proceeding, as it could indicate a man-in-the-middle attack or a legitimate server change.

SSH authentication fails when the SSH agent cannot sign your key. This typically occurs when your SSH key isn't loaded in the agent or the agent has configuration issues, preventing authentication to GitHub or other SSH servers.

SSH authentication failed occurs when the server rejects your login credentials or keys. This can happen due to incorrect credentials, permission issues with key files, wrong key usage, or server configuration mismatches.

SSH shows 'type -1' when it cannot find or load an identity file. This usually means the key file doesn't exist at the specified path or cannot be read. While often a harmless informational message, it indicates SSH is falling back to other authentication methods.

The "client_loop: send disconnect: Broken pipe" error occurs when an idle SSH connection is terminated by the server, firewall, or NAT device due to inactivity timeout. It's common in remote work and cloud environments where keepalive settings aren't configured.

The SSH server terminated your connection unexpectedly, usually due to inactivity timeouts, network issues, or misconfigured keepalive settings. This can happen during idle sessions or when firewall rules drop inactive connections.

This SSH error appears when authentication fails due to incorrect credentials, disabled password authentication, or mismatched SSH keys. It typically occurs when logging in with password or public key authentication. Resolve it by verifying credentials, enabling password authentication on the server, or ensuring your SSH keys are properly configured.

This error occurs when SSH cannot verify the authenticity of a remote host's key because it doesn't exist in your known_hosts file or has changed. It's a security feature that prevents man-in-the-middle attacks but requires manual verification the first time you connect to a host.

This error occurs when SSH cannot resolve a hostname due to DNS failures. Check your internet connection, verify DNS server configuration, and ensure your firewall isn't blocking DNS queries (port 53).

This error occurs when the SSH server abruptly closes the connection during the protocol handshake, before authentication is completed. It typically indicates server-side configuration issues, resource constraints, or firewall restrictions rather than a networking connectivity problem.