Some of the network tests exercise the system's ability to request a specific port for a UDP connection. This port is determined dynamically each time the test is run. By default, a test asks the operating system to determine a free port and then the test requests that port.

On some systems the set of ports that are allocated by the operating system is different than the set of ports that can be specifically requested by client code (in this case, the tests).

If the operating system on which you run the tests imposes this restriction, answer "Yes". If you answer "Yes" you will be asked to specify the lower and upper bounds of the range of ports that the tests can request.