TCP load balancing 2 licensed servers

I have 2 RFGen servers that use telnet to connect from a client. One server has 150 licenses, the other 100. If the server with 100 has all licenses used, you can still connect but you get an “out of license” message. This makes round-robin and least connections unusable because it still makes the connection. Any ideas?

configure per server maxconn appropriately.