How do I close an open port from the terminal on the Mac?

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I opened port #5955 from a java class to comunicate from a client. How do i close this port after I am done? and also which command can show me if port open or closed?

  1. Find out the process ID (PID) which is occupying the port number (e.g., 5955) you would like to free

    sudo lsof -i :5955
    
  2. Kill the process which is currently using the port using its PID

    sudo kill -9 PID
    

How do I stop a server from running on port 8080 Mac? Open or quit Terminal on Mac. Each window in Terminal represents an instance of a shell process. The window contains a prompt that indicates you can enter a command. The prompt you see depends on your Terminal and shell preferences, but it often includes the name of the host you’re logged in to, your current working folder, your user name, and a prompt symbol.

To find the process try:

sudo lsof -i :portNumber

Kill the process which is currently using the port using its PID

kill PID

and then check to see if the port closed. If not, try:

kill -9 PID

I would only do the following if the previous didnt work

sudo kill -9 PID

Just to be safe. Again depending on how you opened the port, this may not matter.

Is there a terminal command (other than lsof) than can close open ports? One option which doesn't work is the "tcpkill" command, which  You can think of a port as a window in a wall; some ports are left open on purpose to allow incoming and outgoing data traffic.) But by default, OS X doesn’t leave many ports open.

However you opened the port, you close it in the same way. For example, if you created a socket, bound it to port 0.0.0.0:5955, and called listen, close that same socket.

You can also just kill the process that has the port open.

If you want to find out what process has a port open, try this:

lsof -i :5955

If you want to know whether a port is open, you can do the same lsof command (if any process has it open, it's open; otherwise, it's not), or you can just try to connect to it, e.g.:

nc localhost 5955

If it returns immediately with no output, the port isn't open.

It may be worth mentioning that, technically speaking, it's not a port that's open, but a host:port combination. For example, if you're plugged into a LAN as 10.0.1.2, you could bind a socket to 127.0.0.1:5955, or 10.0.1.2:5955, without either one affecting the other, or you could bind to 0.0.0.0:5955 to handle both at once. You can see all of your computer's IPv4 and IPv6 addresses with the ifconfig command.

How to Kill service running on port using terminal command. Open Terminal. Run the command with the port used : example : lsof -i : <port_number>. You will get an output with ProcessID - PID if some process is running on it. Now kill the process by running the following command : kill -9 <PID> (example : kill -9 4133). You can allow or block incoming traffic to specific apps using the Security settings, but you can open specific ports in terminal. This used to be done using ipfw, but in OS X 10.10 and later you

very simple find port 5900:

sudo lsof -i :5900

then considering 59553 as PID

sudo kill 59553

How do I close an open port from the terminal on the Mac? new_gist_file. #Find out the process ID (PID) which is occupying the port number (e.g., 5955) you  I restarted my mac and once I had the application running at port 1234, the status reported by nmap command (mentioned above) changed to ‘open’ and I was able to use my mac’s ip and port to access the application from another computer. You can also use Network Utility – Port Scan to scan for open ports on your mac.

In 2018 here is what worked for me using MacOS HighSierra:

sudo lsof -nPi :yourPortNumber

then:

sudo kill -9 yourPIDnumber

And while Leopard leaves open more ports than earlier versions of Mac OS X, so far there have been no known attacks on those default  How to exit your Terminal on a Mac. Close All Open Apps with a Single Click on Your Mac Terminal Lesson 5 - Close applications with the Terminal - Duration:

You can't close an open socket just like this. Ideally, you would just kill the process that has established the connection. Check your connections with lsof  Any open ports detected during the scan will be reported as shown in the screenshot. In this particular scan, these ports have been detected as being open on the server: 80, 1027, 135, 1457, 3389, 139, 8443. These are all TCP ports, and UDP ports identified by the. Acunetix network scanner are reported separately.

What ports are open for hacking on my Mac and Linux machine? Drag your Terminal window wider to remove word-wrap. COMMAND PID USER FD TYPE In Node, close all connections when the app closes completely: How to open Terminal on Mac. The Terminal app is in the Utilities folder in Applications. To open it, either open your Applications folder, then open Utilities and double-click on Terminal, or press Command - spacebar to launch Spotlight and type "Terminal," then double-click the search result.

Knowing which ports are open on your computer can help you assess the security of your system or troubleshoot connection problems. On your Mac, open the  Choose scan to see what ports the server responds to. List open files = lsof. In a Terminal command line: lsof -nP +c 15 | grep LISTEN PROTIP: If you’ll be using this often, create an alias such as of. “lsof” is a contraction for “list open files”. Without any options specifications, lsof lists all open files belonging to all active

Comments
  • How did you open that port? It is not clear whether you are talking about opening and closing the ports in the java application or from the firewall.
  • Sending -9 should not be the first attempt to kill a process, and it a very bad habit. As I recall, you should first just use kill PID(which implies -15), then try -2 and -1. -9 is the last resort only if every other options failed to work.
  • did kill pID without any flags as suggested by @Meow and this worked for me
  • This doesn't add anything to the existing answers!
  • lsof -nPi is slightly better because the port number is actually visible in the output and you get a better feeling of what you are killing.
  • Also helpful just to see all listening ports' info: sudo lsof -nPi | grep LISTEN
  • You saved my day. For some reason lsof in combination with kill didn't return anything and made my script hang on macOS Sierra. But killport works like a charm and is faster. Thanks!