5 способов решить проблему с входом в SSH после обновления Debian

SSH (Secure Shell) is a widely used network protocol for securely accessing remote machines. It provides a secure encrypted connection between the client and the server, allowing users to log in and execute commands remotely.

SSH Password Login Not Working After Debian Upgrade

After performing a Debian upgrade, you may encounter issues with logging in via SSH using your password. Even though you are certain that the credentials are correct, you receive an error message indicating that the login failed.

There are a few possible reasons for this problem, and we will explore some troubleshooting steps to help you regain access.

1. Double-Check sshd_config

The first thing you should do is review the sshd_config file, which is responsible for configuring the SSH server on your Debian system. Ensure that the settings are properly configured for password authentication.

You can locate the sshd_config file by accessing your server through the VPS provider's console or using the command line interface with the following command:

sudo nano /etc/ssh/sshd_config

Once the file is open, look for the line containing the PasswordAuthentication directive. It should be set to yes. If not, change it and save the file using the appropriate command.

2. Restart SSH Service

After making any changes to the sshd_config file, it is crucial to restart the SSH service for the modifications to take effect. You can do this by running the following command:

sudo service ssh restart

This will reload the SSH service with the updated configuration.

3. Verify Firewall Settings

Firewalls can sometimes block SSH connections, resulting in login failures. Check if any firewall rules have been modified during the Debian upgrade process.

If you are using the default UFW firewall, you can verify the SSH rules by running:

sudo ufw status

Ensure that the output shows that SSH access is allowed. If it is not, you can add the necessary rule by executing:

sudo ufw allow ssh

4. Try Different SSH Port

By default, SSH operates on port 22. However, it's possible that during the Debian upgrade, the port may have been changed.

If you suspect this is the case, you can try connecting to a different SSH port by specifying the port number in the SSH command:

ssh username@server_ip -p [port_number]

Replace [port_number] with the actual port number you want to connect to.

5. Contact VPS Provider Support

If you have exhausted all options and still cannot log in via SSH, reaching out to your VPS provider's support team is advisable. They can help you troubleshoot the issue further and ensure that everything is configured correctly on their end.

In conclusion, encountering SSH login issues after a Debian upgrade can be frustrating. However, by following the troubleshooting steps outlined above, you should be able to resolve the problem and regain SSH access to your server.