The firewall configuration options for MCS are shown in the image below.
Permit checkbox:To disable firewall testing entirely, uncheck this box.
Allow TCP testing only on ports: When configuring a firewall test the user picks what ports to test. To limit the ports that can be tested, do that here. This input is for TCP ports only.
Allow UDP testing only on ports: When configuring a firewall test the user picks what ports to test. To limit the ports that can be tested, do that here. This input is for UDP ports only.
Thread timeout: This setting limits the maximum rate of packets the test can use, once the test exceeds this it will stop.
Please note that any changes to the settings will not be saved until you click the "Save" button located at the bottom of the page.