Tijen,
I am not sure you can prevent the connection. I think all you can do is to KILL any messages from an unwanted connection. Perhaps alert someone via Page/Email that messages were being received from an unwanted connectio; perhaps even return an agreed upon acknowledgment indicating a problem.
I think if you want to control who connects to Cloverleaf you will need to deploy a firewall – after all that is what they are for.
Jim Kosloskey
email: jim.kosloskey@jim-kosloskey.com 30+ years Cloverleaf, 60 years IT – old fart.