Let’s discuss some of the steps to consider when the Ubuntu Server SSH disconnects. At Bobcares, with our Server Management Service, we can handle your issues.

Ubuntu Server SSH Disconnects: Why?

There are a number of possible causes if the Ubuntu Server SSH connection keeps dropping. The following are some typical reasons and fixes:

1. Verify the connectivity to the network. Verify that there is a steady network connection between the client and the server. SSH issues may occur as a result of a shaky or unreliable connection. To check the stability of the network, use tools such as ping.

2. SSH connections can be blocked by firewalls on the client and server sides. Make sure that SSH traffic can reach the required ports, which are by default port 22. Using sudo ufw status on the server, we can check the firewall’s status and modify the rules as necessary.

3. Certain SSH servers are set up to cut off inactive links after a specific period of time. To change the ClientAliveInterval or remove it completely, edit the server’s sshd_config file. Restart the SSH service after that.

4. Disconnections may occur from authentication problems, such as using the wrong credentials. Verify the login details or key-based authentication twice.

5. Verify that there are no software incompatibilities on the client or server ends. Other programs may also interrupt SSH connection. To check if the problem still exists, we can also try momentarily turning off any useless services.

6. SSH disconnects may be caused by limited resources or heavy server loads. Use tools such as top or htop to monitor the server’s use of resources (CPU, memory, and disk space). Fix any problems pertaining to resources.

7. Verify whether the SSH client configuration, such as that found in ssh_config, has any timeout settings on the client side. It could be beneficial to change the timeout numbers.

8. Confirm that the SSH client and server are running the most recent versions. With the package manager, we can update them.

9. Connection issues may arise from incorrect MTU settings. Consider using automated MTU discovery or modifying the MTU parameters on the client and server.

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Conclusion

We should be able to locate and fix the problem causing SSH disconnections on the Ubuntu Server by fixing these areas.