Kernels fail to start as ports are blocked

Python kernels use a total of 5 ports for communication. If any one of these ports are blocked (via some security policy or the like), the kernel communication will not function as expected. As a result, the kernel will not function as expected.

The Jupyter extension uses random ports for communications with the kernel. These ports are listed in the Jupyter output panel as follows: Info 12:17:00: Kernel launching with ports 9000,9001,9002,9003,9004. Start port is 9000

Please ensure all of these ports are unblocked.