Troubleshooting Raspberry Pi SSH Issues: Permission Denied (publickey,password)
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Summary: Learn how to troubleshoot and resolve Permission Denied errors (publickey,password) when using SSH on your Raspberry Pi. Explore common causes and step-by-step solutions to ensure a secure and smooth connection.
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Troubleshooting Raspberry Pi SSH Issues: Permission Denied (publickey,password)
Raspberry Pi enthusiasts often encounter challenges when setting up and using SSH (Secure Shell) to remotely access their devices. One common error that users may encounter is the "Permission Denied (publickey,password)" message. This issue can be frustrating, but with a systematic approach, it can be effectively addressed. In this guide, we will explore the common causes of this error and provide step-by-step solutions to help you troubleshoot and resolve the problem.
Understanding the Error Message
The error message "Permission Denied (publickey,password)" indicates that the SSH server on your Raspberry Pi is rejecting the authentication attempt. This rejection can occur due to various reasons, and understanding the underlying causes is crucial for effective troubleshooting.
Common Causes and Solutions
Incorrect SSH Key Pair:
Cause: The public or private key used for authentication may be incorrect or mismatched.
Solution: Double-check the key pair, regenerate if necessary, and ensure they are correctly configured on both the client and Raspberry Pi.
Incorrect Username:
Cause: Providing an incorrect username during the SSH connection attempt.
Solution: Verify the correct username for your Raspberry Pi and use it when connecting via SSH.
File Permissions:
Cause: Incorrect permissions on the ~/.ssh directory or authorized_keys file.
Solution: Ensure that the ~/.ssh directory has the correct permissions (700) and authorized_keys file has the appropriate permissions (600).
SSH Agent Issues:
Cause: Issues with the SSH agent handling the key.
Solution: Restart the SSH agent, add the key using ssh-add, and try connecting again.
Firewall Configuration:
Cause: Firewall settings blocking the SSH connection.
Solution: Check firewall settings on both the client and Raspberry Pi, and ensure that SSH traffic is allowed.
Step-by-Step Troubleshooting
Check Key Pair:
Verify the correctness of your SSH key pair.
Verify Username:
Ensure you are using the correct username for your Raspberry Pi.
Check File Permissions:
Confirm that the ~/.ssh directory and authorized_keys file have the right permissions.
Restart SSH Agent:
Restart the SSH agent on the client machine and add the key using ssh-add.
Inspect Firewall Settings:
Examine firewall settings on both the client and Raspberry Pi.
By following these steps, you can systematically identify and resolve the "Permission Denied (publickey,password)" error when using SSH with your Raspberry Pi. Remember to double-check each element of your SSH configuration to ensure a secure and successful connection.
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