Debian Linux OS meeda oka question

[VictoryTDP]

Sshd config 

[jalsa01]

post complete error 

[TuesdayStories]

On 1/8/2025 at 4:59 AM, jefferson1 said:

I configuered on virtual box, tried ssh into the server. getting an error

 

anyone had the same issue.

1. Check Network Settings

 * Bridged Networking: This mode connects your virtual machine directly to your physical network, giving it its own IP address on your local network.

   * Pros: Allows your VM to act like a real computer on your network.

   * Cons: Can sometimes cause IP address conflicts if not configured correctly.

 * NAT (Network Address Translation): This is the most common and often easiest to set up. It isolates the VM from your physical network but provides internet access through the host machine.

   * Pros: Simple to set up, no IP address conflicts.

   * Cons: More limited network access compared to bridged networking.

 * Host-Only Networking: Creates a separate virtual network that only the host machine and the VM can access.

   * Pros: Ideal for testing or development environments.

   * Cons: No internet access unless specifically configured.

2. Verify SSH Server is Running

 * Check SSH Service Status:

   * On the guest OS (inside the VM), use the appropriate command to check if the SSH service is running:

     * Linux/macOS: sudo systemctl status sshd

     * Windows: sc query sshd

 * Start/Restart SSH Service:

   * If the SSH service is not running:

     * Linux/macOS: sudo systemctl start sshd

     * Windows: sc start sshd

3. Firewall Rules

 * Check Firewall Rules: Ensure your firewall (both on the host machine and the guest OS) allows SSH traffic.

   * Linux/macOS:

     * Use ufw (Uncomplicated Firewall) or iptables to check and adjust firewall rules.

     * Example: sudo ufw allow ssh

   * Windows:

     * Check Windows Firewall settings and ensure it allows inbound traffic on port 22 (default SSH port).

4. SSH Client Configuration

 * Correct IP Address/Hostname:

   * Use the correct IP address or hostname of your VM.

     * Find the VM's IP Address:

       * Bridged Networking: Use ip addr show (Linux) or ifconfig (macOS) within the VM to find its IP address.

       * NAT/Host-Only: You may need to find the VM's IP address within the VirtualBox GUI (look for the VM's network settings).

 * SSH Key Pairs (Recommended):

   * Generate an SSH key pair:

     * ssh-keygen -t rsa (Linux/macOS)

   * Copy the public key to the ~/.ssh/authorized_keys file on the VM. This provides more secure authentication than passwords.

5. Common SSH Errors and Troubleshooting

 * "Connection refused":

   * SSH service might not be running on the server.

   * Firewall might be blocking SSH connections.

 * "Permission denied":

   * Incorrect username/password.

   * SSH keys might not be configured correctly.

 * "Host key verification failed":

   * The server's SSH host key has changed.

   * Use ssh -o "StrictHostKeyChecking no" <username>@<ip_address> to bypass this warning (not recommended for production environments).

Example SSH Command:

ssh <username>@<ip_address_or_hostname> 

 

If you're still encountering issues:

 * Provide the exact error message: This will help in pinpointing the specific problem.

 * Describe your network configuration: (Bridged, NAT, Host-Only)

 * Specify the operating systems: (Host OS, Guest OS)

I'm here to assist further if you can

provide more details about the error and your setup.

By gemini AI