How to solve the issue of being unable to log in with t…

If you are certain that your password is correct but still unable to log in to the CentOS system, you can try the following troubleshooting methods:

1. Check network connection: Make sure your internet connection is working properly by pinging other servers or testing with other network devices.
2. Check if the SSH service is running by using the command ‘systemctl status sshd’. If the service is not running, you can start the SSH service with the command ‘systemctl start sshd’.
3. Check firewall settings: CentOS systems by default use the firewall iptables or firewalld, make sure your firewall settings allow SSH connections. You can use the following command to check firewall rules:

1. For iptables, the command is iptables -L.
2. For firewall-d: firewall-cmd –list-all.

If the firewall settings are incorrect, you can use the following commands to modify the firewall rules.

1. For iptables: Allow incoming TCP traffic on port 22 by using the command iptables -A INPUT -p tcp –dport 22 -j ACCEPT.
2. For firewalld: use the command firewall-cmd –permanent –add-service=ssh

Then reboot the firewall service.

1. Check the SSH configuration file to make sure the settings in the file /etc/ssh/sshd_config for the SSH service are correct. You can try using the default configuration file or make modifications as needed. After making changes, restart the SSH service.
2. Check the permission of the logged-in user: Make sure the username you are using has login privileges, you can try logging in with a different username.

If the above methods still do not solve the problem, it may be due to other reasons that prevent you from logging in. Try restarting the system or contacting the system administrator for further investigation.