Troubleshooting "ssh: connect to host HOSTNAME port 22: Connection timed out" Error in Ubuntu
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Summary: Learn how to troubleshoot and resolve the "ssh: connect to host HOSTNAME port 22: Connection timed out" error in Ubuntu. Understand common causes and step-by-step solutions to ensure a smooth SSH connection experience.
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Troubleshooting "ssh: connect to host HOSTNAME port 22: Connection timed out" Error in Ubuntu
If you've encountered the "ssh: connect to host HOSTNAME port 22: Connection timed out" error in Ubuntu, it can be frustrating, especially when trying to establish an SSH connection. This error typically indicates that the SSH client is unable to reach the specified host on port 22 within the given timeout period. Here are some common causes and solutions to resolve this issue.
Network Connection Issues
The most common cause of this error is network-related problems. Ensure that the host machine is reachable from your local machine. Check if there are any network outages or firewalls blocking the SSH connection. You can use tools like ping to check the connectivity to the host:
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If the host is unreachable, investigate network issues or contact your network administrator.
SSH Service Not Running
Verify that the SSH service is running on the host machine. You can do this by logging in through another method (e.g., physical access or a remote console) and checking the status of the SSH service:
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If the service is not running, start it using:
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And enable it to start on boot:
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Firewall Configuration
Check the firewall settings on both the local and remote machines. Ensure that port 22 is open for SSH connections. You can use the ufw (Uncomplicated Firewall) tool to manage firewall rules:
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Reload the firewall:
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SSH Configuration
Inspect the SSH server configuration on the host machine. The SSH daemon configuration file is usually located at /etc/ssh/sshd_config. Ensure that the port is set to 22 and that SSH is allowed:
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After making changes, restart the SSH service:
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IP Address Changes
If the host machine's IP address has changed, update your SSH configuration accordingly. If you are connecting via hostname, make sure it resolves to the correct IP address.
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Update the IP address for the hostname.
After applying these troubleshooting steps, attempt to connect via SSH again. If the issue persists, double-check each step and ensure that your configurations are accurate.
Remember, the "ssh: connect to host HOSTNAME port 22: Connection timed out" error is a generic message that can have various causes. Carefully investigate each possibility to identify and address the specific issue in your case.
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