2500 A secure shell (SSH) session limit for the cluster has been reached.

Explanation
Secure Shell (SSH) sessions are used by applications
that manage the cluster. An example of such an application is the
command-line interface (CLI). An application must initially log in
to the cluster to create an SSH session. The cluster imposes a limit
on the number of SSH sessions that can be open at one time. This error
indicates that the limit on the number of SSH sessions has been reached
and that no more logins can be accepted until a current session logs
out.
The limit on the number of SSH sessions is usually reached
because multiple users have opened an SSH session but have forgotten
to close the SSH session when they are no longer using the application.

User response

Because this error indicates a problem with the number of sessions
that are attempting external access to the cluster, determine the
reason that so many SSH sessions have been opened.

Run the Fix Procedure for this error on the panel at Management GUI Troubleshooting > Recommended
Actions to view and manage the open SSH
sessions.