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Find port number not in use
(defun port-available-p (port)
(handler-case (let ((socket (usocket:socket-listen "" port :reuse-address t)))
(usocket:socket-close socket))
(usocket:address-in-use-error (e) (declare (ignore e)) nil)))
;; Find port number not in use from 50000 to 60000.
(loop for port from (+ 50000 (random 1000)) upto 60000
if (port-available-p port)
return port)
;=> 50177
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