I have a systems which has multiple users but only few selected users are allowed to login to the system at a given time through SSH (or otherwise).
I am using "passwd -l/-u" command to lock and unlock users, and allow only one user at a time.
What I need is to tell the other users trying to SSH to a system why they cannot SSH. Currently when the user account is locked and they cannot SSH they only get "Connection Refused" message. I want to be able to edit this message to tell them "Your account is locked and you cannot login before xxxxxxx time"
What are the possible ways I can achieve this. I have tried googling for this but without any luck.