python - cherrypy didn't work correctly whith daemonize -

i'm new in cherrypy, , try develop small application using framework. problem is, application can serves , browser can access when cherrypy works in undaemonizer mode. when write code using cherrypy.process.plugins.daemonizer(), cherrypy started in background, , listen on specific port, browser connection refused( iptables or ufw shutted down still inaccessible ). incredible thing is, when start daemoned mode, can still start undaemoned process , , listen on same port. wonder why happend, , how solve it?

simply saids: daemonizer starts, cherrypy listened on specified port, browser connection refused; without daemonizer, cherrypy works well.

thanks alot

with code

from optparse import optionparser  cherrypy.process.plugins import daemonizer  cherrypy.process.plugins import pidfile  import cherrypy  import json  import urllib  import datetime  try:      import cpickle pickle  except:      import pickle  import time  import base64  import os  import sys    '''  cherrypy class  '''    class index(object):      @cherrypy.expose      def index(self):          return "say hello yellow elephant"      class system(object):      @cherrypy.expose      def env(self, token):          local_token = token()          if local_token.authtoken(token) true:              env = get_env()              return json.dumps(env)          return '{"errcode", "invalid token"}'      class jmx(object):      @cherrypy.expose      def get(self, token, host, port, qry):          local_token = token()          if local_token.authtoken(token) true:              url = 'http://' + host + ':' + port + '/jmx?qry=' + qry              jmx = urllib.urlopen(url)              jmx_data = jmx.read().replace('\n', '')              jmx.close()              return jmx_data          return '{"errcode", "invalid token"}'      """  command uses base64 encode using http post method  """    class command(object):      def __init__(self):          self.fname = datetime.datetime.now().strftime('%y-%m-%d_%m-%m-%s') + '.log'        @cherrypy.expose      def run(self, token, command):          local_token = token()          command = base64.b64decode(command)          if local_token.authtoken(token) true:              os.popen(command + ' 2>&1 > /usr/lib/agent/output/' + self.fname)          return '{"errcode", "invalid token"}'        @cherrypy.expose      def readlog(self, token):          local_token = token()          if local_token.authtoken(token) true:              log = open('/usr/lib/agent/output/' + self.fname)              lines = log.readlines()              log.close()              return json.dumps(lines, ensure_ascii=false)          return '{"errcode", "invalid token"}'    """  first time access central, create new token on slave node, token pickle.dump(cacl_mysql_passwd(conf['agent']['secret']))  token created , if central makes change secret, slave node inaccessible!!!  """  class token(object):      def authtoken(self, token):          if(os.path.isfile('/usr/lib/agent/key/authenticate.key')) false:              return self.createtoken(token)          else:              try:                  k = open('/usr/lib/agent/key/authenticate.key', 'rb')                  tokenizer = pickle.load(k)                  k.close()                  if token == tokenizer:                      return true                  else:                      return false              except ioerror, e:                  return '{"errcode":"' + str(e).replace('\n', '<br/>') + '"}'        @cherrypy.expose      def createtoken(self, token):          if(os.path.isfile('/usr/lib/agent/key/authenticate.key')) false:              try:                  k = open('/usr/lib/agent/key/authenticate.key', 'wb')                  pickle.dump(token, k)                  k.close()                  return true              except ioerror, e:                  return '{"exception":"' + str(e).replace('\n', '<br/>') + '"}'          else:              return '{"errcode":"token exists"}'      class controller:      def __init__(self, pidfile='/var/run/agent/agent.pid', host='0.0.0.0', port=30050):          self.port = port          self.host = host          self.pidfile = pidfile          self.settings = {              'global': {                  'server.socket_port': port,                  'server.socket_host': host,                  'server.socket_file': '',                  'server.socket_queue_size': 5,                  'server.protocol_version': 'http/1.1',                  'server.log_to_screen': true,                  'server.log_file': '',                  'server.reverse_dns': false,                  'server.thread_pool': 10,                  'server.environment': 'production',                  'engine.timeout_monitor.on': false              }          }        def start(self):          if os.path.exists(self.pidfile):              sys.stderr.write('pid file exists, server running?\n')              sys.exit(1)          else:              daemonizer(cherrypy.engine, stdin='/dev/stdin', stdout='/dev/stdout', stderr='/dev/stderr').subscribe()              pidfile(cherrypy.engine, self.pidfile).subscribe()              cherrypy.tree.mount(index(), '/')              cherrypy.tree.mount(system(), '/system')              cherrypy.tree.mount(command(), '/command')              cherrypy.tree.mount(jmx(), '/jmx')              cherrypy.config.update(self.settings)              cherrypy.engine.start()              cherrypy.engine.block()        def stop(self):          cherrypy.config.update(self.settings)          if os.path.exists(self.pidfile):              cherrypy.engine.stop()              cherrypy.engine.exit()              try:                  process = open(self.pidfile).read().strip()                  if process != 0:                      os.popen('kill -9 %s' % process)                      os.remove(self.pidfile)              except ioerror, e:                  sys.stderr.write(str(e))          else:              sys.stderr.write('pid file not exist, server gone?\n')              sys.exit(1)      if '__main__' == __name__:      cherrypy.engine.autoreload.stop()      cherrypy.engine.autoreload.unsubscribe()      syntax = 'syntax: %prog -b 192.168.1.1 -s start'      parser = optionparser(usage=syntax)      ip = os.popen('hostname -i').read().strip()      hostname = os.popen('hostname --fqdn').read().strip()      parser.add_option('-b', '--bind', action='store', type='string', dest='bind', default=ip, help='inner network ip address, default value hostname -i')      parser.add_option('-s', '--signal', action='store', type='string', dest='signal', help='valid signal {start|stop|restart}')      options, args = parser.parse_args()        if len(sys.argv) == 1:          print 'use %s -h or --help help.' % sys.argv[0]      else:          if options.signal == '':              print 'must give -s option\'s value'          else:              daemon = controller(pidfile='/var/run/agent/agent.pid', host=options.bind)              if 'start' == options.signal:                  daemon.start()              elif 'stop' == options.signal:                  daemon.stop()              else:                  print 'invalid signal'                  sys.exit(1)