You can using the socket module to simply check if a port is open or not. It would look something like this. import socket sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM) result = sock.connect_ex((‘127.0.0.1’,80)) if result == 0: print “Port is open” else: print “Port is not open” sock.close()
There are many services, which can listen port 80 on windows. Luckily you can detect and stop them all running simple console command: NET stop HTTP When you’ll start it, you will get list first: To avoid this problem in future go to Local Services and disable listed services. N.B. – Some services will restart … Read more
On macOS Big Sur and later, use this command: sudo lsof -i -P | grep LISTEN | grep :$PORT or to just see just IPv4: sudo lsof -nP -i4TCP:$PORT | grep LISTEN On older versions, use one of the following forms: sudo lsof -nP -iTCP:$PORT | grep LISTEN sudo lsof -nP -i:$PORT | grep LISTEN … Read more