The “System bootup in progress. Please wait.” message can appear when you try to log in to a Linux system via SSH. This message indicates that the system is still in the process of booting up and is not yet ready to accept logins. This error can occur if you try to access the system too soon after it has been rebooted.
To resolve this issue, wait a few minutes and try logging in again. If the problem persists, you may need to check if the system is experiencing any issues during bootup. You can do this by logging in to the system locally or via a console connection and checking the system logs.
If there are no issues with the system, you may want to check the SSH server logs to see if there are any errors or warnings that may be causing the problem. The SSH server logs are typically located in the /var/log/secure file.
To check the SSH server logs, you can use the following command:
sudo tail -f /var/log/secure
This will display the last few lines of the secure log file and continue to show any new log entries as they are generated. If there are any errors or warnings related to SSH, they should appear in the log output. (https://lsu79.org)
If you are still having trouble logging in after checking the logs, you may want to try restarting the SSH service on the system. You can do this with the following command:
sudo systemctl restart sshd
This will restart the SSH server and may resolve any issues that were preventing you from logging in.