[ROS2] ros2 command stucks without exit

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Hi,

I'm planning to convert my code to ROS2 Galactic. So i installed on all my machines ROS2 Galactic beside Foxy.

Now I have a problem only on one PC: After sourcing ROS2 Galactic setup.bash file, all ROS2 stuff was corruptet e.g.

• the command $ ros2 node list didn't show any entries and did not exit the command.

• Nodes can be started with $ ros2 run demo_nodes_cpp talker but after interrupt with CTRL+C the process did not finish. I have to press CTRL+Z to get back to the command line (see log below)

  user@towerpc:~$ ros2 run demo_nodes_cpp talker
  [INFO] [1632818912.115210752] [talker]: Publishing: 'Hello World: 1'
  [INFO] [1632818913.115177171] [talker]: Publishing: 'Hello World: 2'
  [INFO] [1632818914.115188251] [talker]: Publishing: 'Hello World: 3'
  [INFO] [1632818915.115207054] [talker]: Publishing: 'Hello World: 4'
  ^C[INFO] [1632818915.232758595] [rclcpp]: signal_handler(signal_value=2)
  ^Z [3]+ Stopped                 ros2 run demo_nodes_cpp talker
  

• restarting daemon with $ ros2 daemon stop stucks without any message and do not exit. After a while a timeout is raised:

  Traceback (most recent call last):
    File "/opt/ros/galactic/bin/ros2", line 11, in <module>
      load_entry_point('ros2cli==0.13.1', 'console_scripts', 'ros2')()
    File "/opt/ros/galactic/lib/python3.8/site-packages/ros2cli/cli.py", line 67, in main
      rc = extension.main(parser=parser, args=args)
    File "/opt/ros/galactic/lib/python3.8/site-packages/ros2cli/command/daemon.py", line 38, in main
      return extension.main(args=args)
    File "/opt/ros/galactic/lib/python3.8/site-packages/ros2cli/verb/daemon/stop.py", line 29, in main
      with DaemonNode(args) as daemon:
    File "/opt/ros/galactic/lib/python3.8/site-packages/ros2cli/node/daemon.py", line 116, in __enter__
      methods = self._proxy.system.listMethods()
    File "/usr/lib/python3.8/xmlrpc/client.py", line 1109, in __call__
      return self.__send(self.__name, args)
    File "/usr/lib/python3.8/xmlrpc/client.py", line 1450, in __request
      response = self.__transport.request(
    File "/usr/lib/python3.8/xmlrpc/client.py", line 1153, in request
      return self.single_request(host, handler, request_body, verbose)
    File "/usr/lib/python3.8/xmlrpc/client.py", line 1165, in single_request
      http_conn = self.send_request(host, handler, request_body, verbose)
    File "/usr/lib/python3.8/xmlrpc/client.py", line 1278, in send_request
      self.send_content(connection, request_body)
    File "/usr/lib/python3.8/xmlrpc/client.py", line 1308, in send_content
      connection.endheaders(request_body)
    File "/usr/lib/python3.8/http/client.py", line 1247, in endheaders
      self._send_output(message_body, encode_chunked=encode_chunked)
    File "/usr/lib/python3.8/http/client.py", line 1007, in _send_output
      self.send(msg)
    File "/usr/lib/python3.8/http/client.py", line 947, in send
      self.connect()
    File "/usr/lib/python3.8/http/client.py", line 918, in connect
      self.sock = self._create_connection(
    File "/usr/lib/python3.8/socket.py", line 808, in create_connection
      raise err
    File "/usr/lib/python3.8/socket.py", line 796, in create_connection
      sock.connect(sa)
  TimeoutError: [Errno 110] Connection timed out
  

All my packages are up to date and only on this PC exists this problem. But I need this PC for Continuous Integration ... (more)