Common Types of SSH Errors

An SSH (Secure Shell) error generally indicates a problem with establishing a secure connection between your computer (the client) and another computer or server (the host).

This article discusses the common SSH errors and how to troubleshoot them. Click on the link below to jump into a specific section

• Common SSH Errors⤵
• Troubleshooting SSH Errors⤵

Common SSH Errors

• Connection Refused: This is the most frequent error. It means the server is not accepting incoming SSH connections. Here are the possible reasons for this error:
  • Server Issues: The SSH service might be stopped or disabled on the server.
  • Firewall Blockage: The server's firewall might be blocking incoming connections on the default SSH port (usually port 22).
  • Network Problems: There could be connectivity issues between your computer and the server.
• Access Denied: This usually means:
  • Incorrect Credentials: You're using the wrong username or password.
  • Account Restrictions: Your user account on the server might not have SSH access privileges.
• Host Key Verification Failed: The server's public key doesn't match what your computer expects. This could happen if:
  • The server's key has been changed.
  • You're connecting to a different server than intended.
• Permission Denied: This usually indicates a problem with file permissions on the server, preventing you from performing certain actions.

Troubleshooting SSH Errors

1. Check Basic Connectivity:
   • Ping the server: Use the ping command to see if you can reach the server's IP address.
   • Check Network Connection: Ensure you have a stable internet connection.
2. Verify Credentials: Double-check your username and password.
3. Check SSH Service Status: On the server, verify that the SSH service is running.
4. Check Firewall Settings:
   • Server-side: Ensure the server's firewall allows incoming SSH connections on port 22.
   • Client-side: If you have a firewall on your computer, make sure it's not blocking SSH connections.
5. Check for SSH Key Issues: If using SSH keys, ensure they are correctly generated, installed, and configured on both the client and server.

Related Articles

• How do I Get and Use SSH Access?
• SSH Keys