zmq.error.ZMQError: Address already in use

[badkey]

When calling the babel environment SRC jupyter-python :session bad :kernel Py310 print("org babel") #+END_SRC the following error encounters ` Executing Jupyter-Python unknown at position 190806... Launching py310 kernel... jupyter--start-kernel-process: Kernel process exited: Traceback (most recent call last): File "/usr/lib/python3.10/runpy.py", line 196, in _run_module_as_main return _run_code(code, main_globals, None, File "/usr/lib/python3.10/runpy.py", line 86, in _run_code exec(code, run_globals) File "/home/jbatke/.virtualenv/Py310/lib/python3.10/site-packages/ipykernel_launcher.py", line 17, in app.launch_new_instance() File "/home/jbatke/.virtualenv/Py310/lib/python3.10/site-packages/traitlets/config/application.py", line 1042, in launch_instance app.initialize(argv) File "/home/jbatke/.virtualenv/Py310/lib/python3.10/site-packages/traitlets/config/application.py", line 113, in inner return method(app, *args, **kwargs) File "/home/jbatke/.virtualenv/Py310/lib/python3.10/site-packages/ipykernel/kernelapp.py", line 678, in initialize self.init_sockets() File "/home/jbatke/.virtualenv/Py310/lib/python3.10/site-packages/ipykernel/kernelapp.py", line 317, in init_sockets self.shell_port = self._bind_socket(self.shell_socket, self.shell_port) File "/home/jbatke/.virtualenv/Py310/lib/python3.10/site-packages/ipykernel/kernelapp.py", line 252, in _bind_socket return self._try_bind_socket(s, port) File "/home/jbatke/.virtualenv/Py310/lib/python3.10/site-packages/ipykernel/kernelapp.py", line 228, in _try_bind_socket s.bind("tcp://%s:%i" % (self.ip, port)) File "/home/jbatke/.virtualenv/Py310/lib/python3.10/site-packages/zmq/sugar/socket.py", line 300, in bind super().bind(addr) File "zmq/backend/cython/socket.pyx", line 564, in zmq.backend.cython.socket.Socket.bind File "zmq/backend/cython/checkrc.pxd", line 28, in zmq.backend.cython.checkrc._check_rc zmq.error.ZMQError: Address already in use

Process jupyter-kernel-py310 exited abnormally with code 1 `

How can I debug that? I have no clue to start (I updraded the virtual env which apparantly did not help). Any hint is welcome. I use emacs 28.2 and emacs-jupyter from melpa.

[badkey]

In the meantime I found (setq jupyter-use-zmq nil) avoids the problem. See issue #464