Socket exception in tcp listener

I trying to run this code:

listener = new TcpListener(IPAddress.Any,port: 80);
            listener.Start();
            socket = listener.AcceptSocket();

but it throws the following exception: An attempt was made to access a socket in a way forbidden by its access permissions

What may be the reason?

Copyright Notice：Content Author:「ByoTic」，Reproduced under the CC 4.0 BY-SA copyright license with a link to the original source and this disclaimer.
Link to original article：https://stackoverflow.com/questions/23593077/socket-exception-in-tcp-listener