Limiting the no. of User Session for GUI Access

Strictly theoretically speaking...if you prevent 443 on mgmt interface and self IPs and force all connections to an clientssl-enabled vip with an iRule like...

when HTTP_REQUEST {
  node 127.0.0.1 80
}

You could add logic to limit sessions. But that requires you open up management access on data paths which is a no-no in some security deployments.

The better more supported solution is to use the built-in tmsh command to do so:

modify sys httpd max-clients 

where is the number of max-clients you desire (default: 10)