Kill a Process by Looking up the Port being used by it from a .BAT

Question

In Windows what can look for port 8080 and try to kill the process it is using through a .BAT file?

Answer 1

Open command prompt and run the following commands

 C:\Users\username>netstat -o -n -a | findstr 0.0:3000
   TCP    0.0.0.0:3000      0.0.0.0:0              LISTENING       3116

C:\Users\username>taskkill /F /PID 3116

, here 3116 is the process ID

Answer 2

Here's a command to get you started:

FOR /F "tokens=4 delims= " %%P IN ('netstat -a -n -o ^| findstr :8080') DO @ECHO TaskKill.exe /PID %%P

When you're confident in your batch file, remove @ECHO.

FOR /F "tokens=4 delims= " %%P IN ('netstat -a -n -o ^| findstr :8080') DO TaskKill.exe /PID %%P

Note that you might need to change this slightly for different OS's. For example, on Windows 7 you might need tokens=5 instead of tokens=4.

How this works

FOR /F ... %variable IN ('command') DO otherCommand %variable...

This lets you execute command, and loop over its output. Each line will be stuffed into %variable, and can be expanded out in otherCommand as many times as you like, wherever you like. %variable in actual use can only have a single-letter name, e.g. %V.

"tokens=4 delims= "

This lets you split up each line by whitespace, and take the 4th chunk in that line, and stuffs it into %variable (in our case, %%P). delims looks empty, but that extra space is actually significant.

netstat -a -n -o

Just run it and find out. According to the command line help, it "Displays all connections and listening ports.", "Displays addresses and port numbers in numerical form.", and "Displays the owning process ID associated with each connection.". I just used these options since someone else suggested it, and it happened to work :)

^|

This takes the output of the first command or program (netstat) and passes it onto a second command program (findstr). If you were using this directly on the command line, instead of inside a command string, you would use | instead of ^|.

findstr :8080

This filters any output that is passed into it, returning only lines that contain :8080.

TaskKill.exe /PID <value>

This kills a running task, using the process ID.

%%P instead of %P

This is required in batch files. If you did this on the command prompt, you would use %P instead.

Answer 3

To find specific process on command line use below command here 8080 is port used by process

netstat -ano | findstr 8080

to kill process use below command here 21424 is process id

taskkill /pid 21424 /F 

Answer 4

Using Merlyn's solution caused other applications to be killed like firefox. These processes were using the same port, but not as a listener:

eg:

netstat -a -n -o | findstr :8085
  TCP    0.0.0.0:8085           0.0.0.0:0              LISTENING       6568
  TCP    127.0.0.1:49616        127.0.0.1:8085         TIME_WAIT       0
  TCP    127.0.0.1:49618        127.0.0.1:8085         TIME_WAIT       0

Therefore, can excluded these by adding "LISTENING" to the findstr as follows:

FOR /F "tokens=5 delims= " %%P IN ('netstat -a -n -o ^| findstr :8085.*LISTENING') DO TaskKill.exe /PID %%P

Answer 5

To list all the process running on port 8080 do the following.

netstat -ano | find "8080"

TCP    0.0.0.0:8080           0.0.0.0:0              LISTENING       10612

TCP    [::]:8080              [::]:0                 LISTENING       10612

Then to kill the process run the following command

taskkill /F /PID 10612

Answer 6

Thank you all, just to add that some process wont close unless the /F force switch is also send with TaskKill. Also with /T switch, all secondary threads of the process will be closed.

C:\>FOR /F "tokens=5 delims= " %P IN ('netstat -a -n -o ^|
 findstr :2002') DO TaskKill.exe /PID %P /T /F

For services it will be necessary to get the name of the service and execute:

sc stop ServiceName

Answer 7

Created a bat file with the below contents, it accepts the input for port number

@ECHO ON
set /p portid=Enter the Port to be killed: 
echo %portid%                                                                              
FOR /F "tokens=5" %%T IN ('netstat -a -n -o ^| findstr %portid% ') DO (
SET /A ProcessId=%%T) &GOTO SkipLine                                                   
:SkipLine                                                                              
echo ProcessId to kill = %ProcessId%
taskkill /f /pid %ProcessId%
PAUSE

Finally click "Enter" to exit.

Answer 8

Just for completion:

I wanted to kill all processes connected to a specific port but not the process listening

the command (in cmd shell) for the port 9001 is:

FOR /F "tokens=5 delims= " %P IN ('netstat -ano ^| findstr -rc:":9001[ ]*ESTA"') DO TaskKill /F /PID %P

findstr:

• r is for expressions and c for exact chain to match.
• [ ]* is for matching spaces

netstat:

• a -> all
• n -> don't resolve (faster)
• o -> pid

It works because netstat prints out the source port then destination port and then ESTABLISHED

Answer 9

If you want to kill the process that's listening on port 8080, you could use PowerShell. Just combine Get-NetTCPConnection cmdlet with Stop-Process.

Tested and should work with PowerShell 5 on Windows 10 or Windows Server 2016. However, I guess that it should also work on older Windows versions that have PowerShell 5 installed.

Here is an example:

PS C:\> Stop-Process -Id (Get-NetTCPConnection -LocalPort 8080).OwningProcess

Confirm
Are you sure you want to perform the Stop-Process operation on the following item: MyTestServer(9408)?
[Y] Yes  [A] Yes to All  [N] No  [L] No to All  [S] Suspend  [?] Help (default is "Y"):

Answer 10

Similar to Merlyn's response, but this one handles these cases as well:

• The port number is actually a left substring of another longer port number that you're not looking for. You want to search for an exact port number so that you do not kill a random, innocent process!
• The script code needs to be able to run more than once and be correct each time, not showing older, incorrect answers.

Here it is:

set serverPid=
for /F "tokens=5 delims= " %%P in ('netstat -a -n -o ^| findstr /E :8080 ') do set serverPid=%%P
if not "%serverPid%" == "" (
  taskkill /PID %serverPid%
) else (
  rem echo Server is not running.
)

Answer 11

Steps:

1. Go to conf folder of your apache tomcat server. In my case,its apache-tomcat-7.0.61\conf as I am using apache-tomcat-7.0.61

2. Open server.xml and change the port number from 8080 to any other port as your wish. For example:8081,8082,8087 etc

3. Now go to bin folder and run shutdown.bat

4. Now restart the server through eclipse.

Now your project will work without any interruption.

Answer 12

If anyone is looking for a Powershell Script:

function Search-And-Destroy
{
    param ( [Parameter(Mandatory=$true)][string]$port )
    $lines = netstat -a -o -n | findstr $port
    $ports = @()

    ForEach($line In $lines)
    {
        $res = $($lines -split '\s+')
        $ports += $res[5]
    }

    $ports = $ports | select -uniq

    ForEach($port In $ports)
    {
        echo $(taskkill /F /PID $port)
    }
}

This function basically does what the above functions do, but it is in the Powershell scripting format so you can add it to your Powershell profile. To find your profile's location go to powershell and type echo $profile

Answer 13

Paste this into command line

FOR /F "tokens=5 delims= " %P IN ('netstat -ano ^| find "LISTENING" ^| find ":8080 "') DO (TASKKILL /PID %P)

If you want to use it in a batch pu %%P instead of %P