Solution Limiting connections made with Policy Manager can be done by managing listen port properties.
To achieve the desired setup you will have to add another port for Policy Manager access and set it to have a thread pool size?to the number of concurrent connections you wish to permit.?You will also have to?remove the 'Policy Manager Access' feature from the ports 8443,9443, and any other port that has the feature enabled. Please follow the steps below in order to achieve this:
1.) Log in to Policy Manager
2.) Under 'Tasks' navigate to 'Manage Listen Ports'
3.) Create a new port that uses HTTPs and ONLY enables Policy Manager Access
4.) On the 'Pool Settings' tab for the new port, check the 'Use private thread pool' box and set the Thread pool size to 1.
5.) Log out of Policy Manager and connect with the new port you created
6.) Under Manage Listen Ports, remove 'Policy Manager access' from 'Enabled Features' for both port 8443 and 9443.
With the steps above you are creating a new management port that only functions for Policy Manager Access with a thread pool size of 1 which in turn only allows one connection to the port. Logging out of PM is because you cannot make changes to administrative ports while they are in use, the default port used by PM to connect is 8443 so we use our new Management port to make changes to 8443 and 9443.