Check what is running on port linux

Check what is running on port linux. \conninfo. An example viewing a file with less: An example viewing a file with less: egil@mutter:~$ lsof foo. if you need to know exactly which one is listening on port 8000 you can use this : sudo netstat -peanut | grep ":8000 ". Sep 16, 2021 · Finding the current MySQL Port. Aug 25, 2021 · Combine the docker ps command with grep to easily check whether a specific container is running by ID or name: docker ps | grep my-container-name. 168. By default, Splunk will run on port 8000 for the web services and port 8089 for splunkd services. 1 Bring up the terminal, type lsof -i :8080. The above command will list running processes and the ports and interfaces they are bound to – the output will look something like this: Proto Recv-Q Send-Q Local Address Foreign Address State PID This is a good thing to remember generally. log to see if there are any problems reported. For a general check if an app is running you could just use ps aux | grep apache2. netstat -ap | grep tcp | grep java | grep LISTEN | awk '{print $7}' | sed 's-/java--' | sort | uniq If anyone knows of a way to then pipe this into the third part please comment. com is running a(n) "http" server Apr 13, 2010 · 6 Answers. (Just replace all the ' [#task]' by the task ID returned) Share. Evan Anderson. The strange thing is that is I run logstash is debug mode like so: Aug 4, 2020 · In the netstat output you can also see the port opened by a specific process. Then you can get the port with lsof. May 3, 2011 · Perhaps use both, one to confirm which is port set for mysql and the other to check that the system is listening through that port. Jan 17, 2017 · Here My code is finding tomcat server running on 8080 port only so that it is easily find whether the tomcat is running or not. Copy. You can see what is actually running using the netstat tool (available on OS X, Windows, and Linux, with command line syntax varying across all three). This will return processes running on port :3000. We need to add -p option in SSH To do that, you can use lsof. I may rephrase DISPLAY is set by something that assumes it knows X is running, it has nothing to do with the fact it is actually running. js project I run this npx pm2 logs. Check a specific port number with this syntax: sudo lsof -nP -i:[port-number] For example, to check if port 5054 is in use, type: sudo lsof -nP -i:5054. com:80 Port 80 of google. First check on the config file which port is configured: $ sudo grep Port /etc/ssh/sshd_config. The nmap command will automatically fetch the IP from the DNS record. May 20, 2017 · Sorted by: 54. Mar 18, 2024 · Here, we’ve created three processes using port 9999 and the protocols SCTP, TCP, and UDP respectively. Then use lsof to see which files have been opened by that PID like so lsof -p pid. Apr 1, 2014 · If you don't know the port or have multiple, you can run this instead of the first command to get the list of PIDs. Jul 23, 2011 · 12. It's showing 0. May 26, 2017 · Mysql run by default on port 3306. Jul 19, 2016 · So even though logstash is running, I can't tell what port it is bound to and listening on. Mar 19, 2024 · We can use the telnet command to check an SMTP connection. Any open ports can be evidence of an intrusion. vivek@nixcraft:$ sudo ss -tulpn | grep LISTEN. 000073s latency). 80/tcp open http. Where hostname is the hostname or IP address of the machine of interest. Jun 11, 2019 · 269. This is true even when the command does not normally need sudo to run correctly. Run the following command to find 8080 port number PID: sudo lsof -t -i:8080. Do you know what I am doing wrong? It almost seems that lsof on alpine linux isn't honoring any arguments. # sudo nmap -sU -O localhost. java 10165 mkyong 52u IPv6 191544 0t0 TCP *:http-alt (LISTEN) Note. Assuming the process ID is 23521, run. On my test machine, my config is stored in /etc/mysql: cat /etc/mysql/my. In the server xml look for the connector details as below; <Connector port="8080" address="localhost". This tells you which program is running on port https. pid file in the PostgreSQL data directory if the database is started. Jan 15, 2015 · Under Windows (WSL), I want to test whether X is already running or not. lsof -P -sTCP:LISTEN -i TCP -a -p 23521. (No info could be read for "-p": geteuid()=901743 but you should be root. We can use the lsof command to find the process using a specific port with the -i :port_number option: The first four columns in the above output tell us the process name listening on port 22 and its PID, owner, and the file descriptor. Note the PID, and then run the following command, replacing [PID] with your PID: kill -15 [PID] nc ip port < /dev/null connects to the server and directly closes the connection again. 72. Please note that the 'grep' command will always also show up as a separate process. The command above will return the task ID of the program that is currently using the port. If you need to run Jenkins on another port, just use the following syntax: java -jar jenkins. Here’s a breakdown of the options used in the command: -t: Display only TCP connections. 5. Open another terminal session on the same machine. Services are background tasks without a UI, while daemons are launched on boot. May 9, 2016 · Using the MySQL configuration file to determine which port it is running on. 2 PID 10165 is using port 8080, type ps -ef | grep 10165 to find out the application Jul 20, 2012 · If you want to kill a process running on port number 8080 then first you need to find the 8080 port process identification number (PID) and then kill it. Type the following command to check the TLS version supported by a specific website: openssl s_client -connect example. Let’s use telnet to check if an SMTP server is running on port 2525: $ telnet localhost 2525. The exit code is stored in the variable $?. If you're using Linux, you can run the following commands on your console: fuser -n tcp 3000. Select the protocols used by the service you wish to access. The port number you entered in step 5 is the same. Also you can use netstat to show all connections and corresponding ports. Another option is to run ss -tulpn to open ports on modern Linux distros. May 19, 2009 · 7. (Replace <PORT> with the port number you want, but keep the colon) The area circled in red shows the PID (process identifier). 1 Connected to myhost. Linux: netstat -tulpn | grep 3306 Window: netstat -a -b Mac: lsof -nP -i4TCP:3306 if you find an application occupying that port, stop the application and restart xampp. Inhibiting conversion may make lsof run Jan 10, 2023 · First, start netcat ( nc) and listen ( -l) on port ( -p) 4000, while sending the output of ls to any connected client: Now, after a client has opened a TCP connection on port 4000, they will receive the output of ls. Try pfiles PID to show all open files for a process. You can check the status of tomcat with the following ways: ps -ef | grep tomcat. port. sudo apt-get install psmisc. -l flag displays listening sockets. The following command will indicate every TCP and UDP open port –. I would suggest you run Jenkins as a service instead of running it using command line. $ netstat -nlp. This tells you that there's a socket listening on port 443. First, find the “postmaster” process, the parent of all other PostgreSQL processes. netstat -anpl|grep ssh. Verifying Which Ports Are Listening. docker run -it --rm -p 80:80 -p 443:443 your_image. -n: This option inhibits the conversion of network numbers to host names for network files. netstat -punta | grep <port>. Jan 22, 2016 · 1. netstat -lnp will list the pid and process name next to each listening port. Now the output will be filtered to show the container you've selected. Share. Improve this answer. Therefore, our domain name is localhost. This command will display the line in the configuration file that contains the word May 7, 2014 · Process with pid 1 will be different between container and host: On Linux host systems it will be systemd or init. If this is the port we just configured, we can safely exit the server and relogin with the new port. $ lsof -i :8080. Then either restart ssh to make sure it loads the config you just saw or find out on which port ssh is running: $ sudo netstat -tpln | egrep '(Proto|ssh)'. This is very helpful indeed to find all the ports of running pm2 apps. There are two basic approaches for listing the ports that are listening on the network. If it isn't, most installers will choose the next free port, usually 5433. If Linux is the client, it depends on which client you're using: if you're using the kernel-level cifs filesystem support, in all but quite new kernels, the answer was that you look into /proc/mounts to see if the mount options for that filesystem include a vers= option; if not, assume Nov 26, 2022 · 443/tcp open https. Also the firewall is stopped temporarily to investigate this. Jul 10, 2023 · There are three ways to verify the ports that are configured for Splunk. 0:* LISTEN 1450/sshd. You can use ps to find the PID or process ID of that process or use ps -u {process-username} to get it's PID. Sep 5, 2016 · , Most shows similar message "port already in use" Fortunately, I searched and found out why. ; lsof – a command line tool to list open files under Linux / UNIX to report a list of all open files and the processes that opened them. This will ensure Jenkins keeps running when you restart your system. Apr 13, 2018 · Therefore, you will see that multiple containers handle ports 80 and 443. Oct 24, 2017 · Run sudo netstat -lp in your terminal; this will tell you what ports are open to receive connections, and what programs are listening on them. Type any one of the following command to check if a port is in use on Linux. – Dec 7, 2019 · The following command will indicate which ports are listening for UDP connections from the network. Using fuser it will give the PID (s) of the multiple instances associated with the listening port. Like for example, netstat -ltnp | grep -w process_name" will do the trick, but it returns Feb 6, 2014 · 66. Escape character is '^]' . conf | grep port. Aug 21, 2020 · The nmap command can be used to check a single port or a series of ports are open. 456. Run netstat -a -o | find "9090" and have a look at the far right column. In the above command, we scan the ports using the hostname google. the -u flag shows udp. 6) Aug 9, 2013 · fuser – a command line tool to identify processes using files or sockets. net stop winnat Most excluded port are released, these port can be used then. As an example, nc ip port < /dev/null; echo $? will return 0 if and only if netcat could successfully connect to the port. 1. Try this: The source code of most applications logs the exposed port when the app is running. Alernatively, you can find the process's PID using ps and grep: ps -ef | grep mysql. That's the Process ID (PID) of the owning process. This command will display a list of all the TCP and UDP ports that are currently listening on the system. Open the terminal and type in any command above with the right option. conf) contains settings that control the behavior of the MongoDB server. Oct 29, 2018 · If you are running a Samba server on Linux, smbstatus should show the protocol version used by each client. 5432/tcp open postgresql. Then you will have to run. Let us see all commands and examples for Linux desktop or server. Mar 18, 2024 · Using lsof. the -p flag will give you the process ID and the process name of whatever is using that port. Using any of the techniques above, we can quickly check the port on which MySQL services are running. ps -aef | grep node. Type “netstat -a -n -o | find “8080””. Feb 20, 2008 · -P: This option inhibits the conversion of port numbers to port names for network files. This will show the ports and service that are open on your machine – check through the list and make sure that postgresql is listed next to the port number 5432. The next step is to kill the processes on that port. Using the fuser Command. (Use netstat -t -l -p -n if you just want the port number, in which case you'll see *:443 instead of *:https). Match it up with running processes in Task Manager. Aug 22, 2023 · To show listening ports using ss, open a terminal window and enter the following command: ss -tuln. 0:80 in the "Local Address" column. The lsof command can list all open files in a Linux system. A great tool to use is ps and lsof. Mar 18, 2024 · In summary, when working with Linux, we must know the port numbers on which the application services run. Apr 27, 2020 · 1. Nmap done: 1 IP address (1 host up) scanned in 12. -u flag shows udp connections. On linux, which uses a weak host model, every application Dec 4, 2022 · Method 4: Checking the MongoDB Configuration File. The command outputs a list of the connections that use the TCP protocol. In first line of docker ps, you publish the port using below command. This article explains how to verify listening ports and port usage in a Linux® system. As an alternative, you 11 Answers. Type “cmd” and click OK in the Run dialog. The results will reveal open ports on that host similar to the following: To check for a specific port such as 443, run nmap -p 443 microsoft. In other words, I want to test BECAUSE I want to set DISPLAY. You can also Feb 5, 2016 · I am running nginx in a docker container that has a port mapping (hostPort:containerPort) - 80:80 The above answers are giving me strange console output. Host is up (0. Jul 14, 2022 · This command helps you find out which files are opened by various processes, the user’s process list, and the list of processes listening on a particular port. netstat. Jun 29, 2023 · Check SSH Port Number in Linux with netstat command. Here’s how to scan port 80 on the target system: $ sudo nmap -p 80 192. This is further complicated on Mac OS X systems . netstat -a | grep 8080. The fuser command is a great tool for terminating processes. In a node. answered Feb 7, 2014 at 3:31. Follow. It provides details like name, load, sub-state, and description. Where, -i : list network files. The netstat command is a network statistics utility that displays information about network connections, routing Oct 24, 2020 · Is there a clean way to check on which port a linux process/service is running/listening to? I know fuser, netcat, lsof, etc all are ways to find that, but they return a bunch of other information along with it. ) Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name. Sep 27, 2019 · As you can see, a python service (simpleHTTPserver in this case) is listening on port number 8000, mysqld service is listening on port 3306, ssh service is running on port number 22, apache2 is running on port 80 and so on. where 8080 is the tomcat port. vivek@nixcraft:$ sudo netstat -tulpn | grep :443. use following command to check app occupying a port. lsof + ps command. 220 a42502410059 smtp4dev ready. Here, sudo - command to ask admin privilege (user id and password). By the cmd "sudo netstat -npl|grep mysql", I can find the ports and db sockets. Dec 25, 2022 · To check open ports in Linux, we can use three methods: the netstat command, the ss command, and the lsof command. Use command netstat -tulpn to open ports. Mar 19, 2024 · Run any one of the following command on Linux to see open ports: $ sudo lsof -i -P -n | grep LISTEN $ sudo netstat -tulpn | grep LISTEN $ sudo ss -tulpn | grep LISTEN $ sudo lsof -i:22 ## see a specific port such as 22 ## $ sudo nmap -sTU -O IP-address-Here Jul 12, 2023 · Use the lsof command to: Display a list of ports in use: sudo lsof -nP -iTCP -sTCP:LISTEN. You'll see it report that you're connected to mySQL. Sep 30, 2021 · Note: This command establishes an SSH tunnel that forwards information from port 5901 on your VNC server to port 59000 on your local machine via port 22 on each machine, the default port for SSH. But of course with port number 21 and not 22 (21 for ftp). I mean, I would like to first check if the port is actually being used by a process. cnf | grep port. The procedure to list open ports in Linux is as follows: Open the terminal application. xml. In addition, here, 5221 is the PID for apache2, so that also tells you which application is being used. Here's a breakdown of the command: ps: is the process status command. conf (CentOS 6. 0. Jan 8, 2013 · -l = only services which are listening on some port-n = show port number, don't try to resolve the service name-t = tcp ports-u = udp ports-p = name of the program; You don't need the 'p' parameter as you're only interested in getting which ports are free and not which program is running on it. kill -9 [#task] with the task ID. Then you can use dpkg -S <binary> to see what package is providing it. 6 and I have found the my. You can control the output using netstat’s command-line options. will give you all open network connections. We will also go Jan 8, 2024 · Here’s how you can check TLS version for a remote server in Linux using openssl command. Output. A list of processes using port 8080 are displayed. If you want a way to remember lsof, it is that it means 'list of'. Systemd is a system and service manager in Linux that launches services. lsof -i list open ports and the corresponding applications. Nmap scan report for 192. sudo netstat -nlp. In our case, we run a local SMTP server. Jul 21, 2015 · Take it to the next level with CurrPorts by NirSoft:. $ sudo ufw status verbose. exe (note: you may need to run it as an administrator, but this isn't always necessary), then run the below command: netstat -ano | findstr :<PORT>. Try sudo netstat -p for the same thing, plus currently-active connections. sudo netstat -plunt |grep postgres. My client uses CentOS 6. Jul 13, 2023 · In Linux, every service running on the server listening to the socket for a client to make a connection request. 04 , you will have added a UFW rule to allow connections to your Aug 19, 2023 · Use "systemctl --type=service --state=running" to see all running services on a Linux system with systemd. 1. Feb 25, 2021 · While this checks if a port is open in Linux, it can generate a lot of output. There'll be no records if the container isn't running. Jun 13, 2022 · Linux find out which port is open using the command line. 9999/tcp: 6431. For example, to view the PID and program name for a system’s listening TCP connections, run netstat with the following command-line options: netstat -ltp. Let’s kill the process using the TCP protocol: $ fuser -k 9999/tcp. Aug 24, 2017 · Step 1: Open up cmd. Oct 29, 2012 · Get early access and see previews of new features. This will return the tomcat path if the tomcat is running. You can also see which ports are opened on a Linux system using the lsof, ss and fuser commands. 1 Answer. If multiple result, try lsof -i :8080 | grep LISTEN. vivek@nixcraft:$ sudo netstat -tulpn | grep LISTEN. We only need to use the -k parameter. 0:22 0. You can have a clean output that shows process id and ports that's listening on. 1 Connected to localhost. CurrPorts displays the list of all currently opened TCP/IP and UDP ports on your local computer. # sudo nmap -n -PN -sT -sU -p- localhost. – May 6, 2022 · In Linux, run: nmap microsoft. Dec 28, 2016 · Then you can use the ports with fuser -n tcp or fuser -n udp, as root, and supposing that fuser is GNU fuser or has similar options. If you want know, the how may nodejs processes running then you can use this command. Using the lsof commandThe lsof (List Open Files) command produces a list of files that are currently open along with the processes that opened them. c COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME less 18871 egil 4r REG 8,2 0 53862540 foo. – Jun 12, 2015 · Try to access the application using the machine name and the port. Open a terminal on your Linux system. But I need to match them one to one by using pid. . Updated 3 months ago. There is no process that can hide from netstat. sudo fuser 80/tcp. Check process name with pid 1. port = 3306. So it will give list of nodejs process with it's project name. For each port in the list, information about the process that opened the port is also displayed, including the process name, full path of the process, version information of the process (product name, file description, and so on), the time that Mar 17, 2014 · You can tell if there's a web server active on the default port for http (80) with: $ telnet hostname 80. Few applications actually supports this, as it is OS specific. Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name. Port 22. Dec 9, 2018 · There you'll get hints where the files are located. The other solutions don't work on windows. Check the status of ufw firewall with the following command. There might be other ports used by other services as well, check netstat output without limitation to port 80 closely. 29 seconds. g 80 and 443, append one more grep to the command: Oct 25, 2014 · Since I also had the same problem of "How to detect a docker daemon port" however I had on OSX and after little digging in I found the answer. In PostgreSQL's case it's typical to use port 5432 if it is available. Assuming you followed the prerequisite Initial Server Setup guide for Ubuntu 20. It will list all the open ports in Linux. So, the script would be something like : test <check if the port 6000 is being used> && kill $( lsof -i:6000 -t ). Or "ps aux | grep httpd" for redhat/centos. war -httpPort=<port-number>. 80/tcp: 1858 1867 1868 1869 1871. Oct 11, 2016 · I'm currently running RethinkDB on its default port, because if I point my browser to localhost:8080 I see the RethinkDB web interface: I'd like to close RethinkDB and re-open it on another port using the --port-offset argument. com. networking. 3. com:443 -tls1_2. It will be taken over from malicious people sooner or later (likely sooner). Sorted by: 104. c egil@mutter:~$ If you really want to confirm that it is running on the port you can telnet into the port while the process is up like so: telnet localhost 3306. netsh interface ipv4 show excludedportrange protocol=tcp Can see some port are exclude for use, through these port not opened and listened. May 9, 2017 · (+1) for great answer there. A little addition: if you're running on a sensitive port like 80, you might need to add sudo before the command. I think a lot of people run into this and having it to see if mongod is running (you need to be root to do this, or prefix everything with sudo). PORT STATE SERVICE. Here,-t flag shows tcp connections. Locate the PID of the process that's using the The program lsof allows you to check which processes are using which ressources, like files or ports. Escape character is '^]'. In Docker container it will be the process that is run by the container, but not systemd or init. You can find the port setting in this file. Check the log file /var/log/mongo/mongo. Also, we’d covered steps for accessing the MySQL server using extracted port details. If netcat is not able to connect, it returns a non-zero exit code. You will not see the container names, but you will see their IP addresses, so you will be able to run docker inspect and find mathces. root@host:~# telnet localhost 2181. You can get it from the postmaster. If you need more help, let me know. To see precisely who listens on certain ports, e. 8. Is there any cmd I can use to show the port number of a db socket directly in Linux? Jun 29, 2021 · To display all running processes for all users on your machine, including their usernames, and to show processes not attached to your terminal, you can use the command below: ps aux. it doesn't show the open ports. # netstat -lntp. It is also useful when port name lookup is not working properly. The command netstat -tanp will show you what PID is associated with what port, look for a line like this to find what daemon is LISTENing on port 21: tcp 0 0 0. Login Linux with new SSH Port. But PLEASE don't. The MongoDB configuration file ( /etc/mongod. vivek@nixcraft:$ sudo lsof -i -P -n | grep LISTEN. linux. Jul 29, 2022 · I'm looking for a command-line utility that allows me to check what service (eg: http/ftp/ssh) is running on a specific port of a remote machine. Status: active. :- < pc-name >:8080. By. And by. It will be helpful when you are running multipe nodejs application & you want kill specific process for the specific project. I was wondering how could I add a test condition before it. One method is to simply telnet to the proper port and execute the stats command. On my test machine this returns. Leave this session alone for now. $ ps -p 1 -o comm=. the end result is a nice, neat, small result set. When combined with the grep command, the lsof command can conduct Sep 18, 2018 · 7. On linux (and openwrt), the only way for an application to listen only on a certain interface is the SO_BINDTODEVICE socket option. Nov 16, 2018 · Most of the time the ports are visible in the logs. Jan 11, 2022 · Use the Windows netstat command to identify which applications are using port 8080: Hold down the Windows key and press the R key to open the Run dialog. An example of how I imagine a program like this would operate: kess@KG-PC:~$ portcheck google. You obviously don't have enough knowledge to run the system all by yourself. If you have shell access to the machine of interest, then you can just use localhost, for example, if there is a webserver active, you will see something like You can run the lsof command, which lists which processes has open files, with your jar file given as an argument. That, or they use packet socket, but that's for low level protocols (like dhcp servers). # netstat -lntu. Only the good old 'nmap' is working flawlessly even catching the nginx version. To check all listening ports with lsof, type: sudo lsof -i -P -n | grep LISTEN. lsof. Jan 8, 2024 · Indeed, these commands show ports that are in a listening state, but that doesn’t necessarily mean that the ports are open to the internet, because our firewall may be denying connections. This will work under Linux, but not all others (like AIX. What was a little strange is that I have tomcat and apache servers running and neither port 8080 nor 80 showed up in the list. Trying 127. You will learn which netstat flags to use to show the port opened by a process on Linux and other tricks that can be very useful to manage a Linux system. a: displays information about other users' processes as well as your own. For specific could add -iTCP -sTCP:LISTEN. We can use netstat command by providing some options to check which port is running for SSH process. you need to check if another application is occupying that port. After finding out, you can either stop or kill the process (es). We can also use the IP in the nmap command if already known. g. This command will give you postgres port number. Oct 15, 2010 · 13. That is why you are seeing HOST_PORT->Container_PORT, to see the same response on another container you need to publish port. There are several ways to find which running process is using a port. and you will see something similar as this. You can use netstat to see which process is listening on which port. Inhibiting the conver-sion may make lsof run a little faster. OR (if it comes as postmaster) sudo netstat -plunt |grep postmaster. Enter the service’s port number in the “Internal Port” field. You can use this command to have a full detail : sudo netstat -peanut. Nov 14, 2019 · I am new on bash scripting and I am trying to write a bash script in which starting from certain port, check if it is listening, if it is, run a command and if it is not increment the port number until it finds one which is listening, any help would be much appreciated. COMMAND PID USER FD TYPE DEVICE SIZE/OFF NODE NAME. Any suggestions would be helpful. Feb 26, 2024 · Open the terminal application on Linux. Here’s how: cat /etc/mongod. Mar 26, 2014 · I have three MySQL database sockets running on a Linux machine. ) Add -t if you want TCP only. Verify the Command Prompt opens. close() method. By using netstat command to find open ports – enter the following command –. In step 1, you ought to have made this determination. E. alpine-linux. To show which processes are listening on port 8080: lsof -Pi :8080 -sTCP:LISTEN Jul 3, 2020 · 0. But What actually i need is to stop/start the tomcat server if it is running or stoped status in some other ports. It always shows the same output - just seems to ignore -i. 631/tcp open ipp. However, so far I haven't been able to close it from within Python using the conn. To check if Zookeeper is accessible. If Postgres is running on a Linux server, you can also use the following command. lsof -i :3000. Jul 23, 2023 · Enter the internal IP address of your Linux system in the “Internal IP Address” field. Else check in the tomcat server configuration connector details in; /conf/server. docker run -it -p 32773:80 -p 32772:443 static-site. The netstat command can tell you which port a running process is using and whether it is open: netstat -tlnp. this will show you connections in ESTABLISHED and LISTEN states UDP and TCP and it will ignore the UNIX local sockets. After configuring network services, it is important to pay attention to which ports are actually listening on the system's network interfaces. You could see the listening port and PID from this if it's running. <binary> is the Nov 25, 2022 · You can confirm this by running the nmap command: sudo nmap localhost. Commands in Linux generally won't give information on processes started by root/sudo unless the command is run with Sudo. Aug 7, 2014 · Sorted by: 40. Upon a successful connection from a client, a socket (a combination of an IP address and a port (a number which identifies an application/service the client is connected to)) is created. If you are running linux, then this is an easy one liner. conf file under /etc/, so I used: grep port /etc/my. fx vs fl gi gy dv gs hx no ud