Got a pesky process listening on a specific port and wanna get rid of it? Run `python killListener.py [port]`. Additional `name` argument can be given to filter out processes going to get killed by name.

killListener.py

import subprocess
import sys

if len(sys.argv) > 1:
    port = sys.argv[1]
else:
    port = '3996'

if (len(sys.argv) > 2):
    name = sys.argv[2]
else:
    name = None

if any(v in ['-h', '--help'] for v in sys.argv):
    print "Usage: python killListener.py [port=3996] [name]"
    exit(0)

try:
    print("> lsof -i tcp:%s" % port)
    res = subprocess.check_output('lsof -i tcp:%s' % port, shell=True)
    print(res)
except:  # returns a non-0 exit code it no result
    print("> # No process listening on port %s. Terminating." % port)
    exit(0)

res = res.split('\n')
if len(res) < 2:
    print("> # No process listening on port %s. Terminating." % port)
    exit(0)

for line in res:
    line = line.split()
    if len(line) < 2:
        continue
    if name is not None and line[0] != name:
        print("> # ignoring process %s pid=%s (not '%s')"
              % (line[0], line[1], name))
        continue

    pid = line[1]

    print('> kill -kill %s' % (pid))
    res2 = subprocess.check_output('kill -kill %s' % (pid), shell=True)
    print(res2)

print("Success!")