If you are seeing the error "SSH System Bootup In Progress Please Wait" when attempting to log in to a Linux system using SSH, it means that the system is currently starting up and the SSH service is not yet available.
This error is usually displayed by the sshd daemon, which is the server component of the SSH service. It is typically displayed when the system is booting up and the sshd daemon has not yet finished starting.
To fix this error, you will need to wait until the system has finished booting up and the SSH service is available. This typically takes a few minutes, depending on the system configuration and the number of services that need to be started.
Once the system has finished booting up and the SSH service is available, you should be able to log in to the system using SSH.
If you are experiencing this error on a regular basis and the system is taking a long time to boot up, it may indicate a problem with the system configuration or with one of the services that is being started during the boot process. In this case, you may need to troubleshoot the issue by examining the system logs or by consulting with a system administrator.