# Buggy code
def create_kernel_manager_and_kernel_client(
    self,
    connection_file,
    stderr_handle,
    is_cython=False,
    is_pylab=False,
    is_sympy=False,
):
    """Create kernel manager and client."""
    # Kernel spec
    kernel_spec = self.create_kernel_spec(
        is_cython=is_cython, is_pylab=is_pylab, is_sympy=is_sympy
    )

    # Kernel manager
    try:
        kernel_manager = SpyderKernelManager(
            connection_file=connection_file,
            config=None,
            autorestart=True,
        )
    except Exception:
        error_msg = _("The error is:<br><br><tt>{}</tt>").format(traceback.format_exc())
        return (error_msg, None)
    kernel_manager._kernel_spec = kernel_spec

    kwargs = {}
    if os.name == "nt":
        # avoid closing fds on win+Python 3.7
        # which prevents interrupts
        # jupyter_client > 5.2.3 will do this by default
        kwargs["close_fds"] = False
    # Catch any error generated when trying to start the kernel.
    # See spyder-ide/spyder#7302.
    try:
        kernel_manager.start_kernel(stderr=stderr_handle, **kwargs)
    except Exception:
        error_msg = _("The error is:<br><br><tt>{}</tt>").format(traceback.format_exc())
        return (error_msg, None)

    # Kernel client
    kernel_client = kernel_manager.client()

    # Increase time to detect if a kernel is alive.
    # See spyder-ide/spyder#3444.
    kernel_client.hb_channel.time_to_dead = 18.0

    return kernel_manager, kernel_client


# Traceback (TimeoutError)
File "C:\Users\Giovanni\Anaconda3\lib\site-packages\spyder\plugins\ipythonconsole\plugin.py", line 547, in set_current_client_working_directory
shellwidget.set_cwd(directory)
File "C:\Users\Giovanni\Anaconda3\lib\site-packages\spyder\plugins\ipythonconsole\widgets\shell.py", line 178, in set_cwd
self.call_kernel(interrupt=True).set_cwd(dirname)
File "C:\Users\Giovanni\Anaconda3\lib\site-packages\spyder_kernels\comms\commbase.py", line 538, in __call__
call_dict, call_data, self._comm_id)
File "C:\Users\Giovanni\Anaconda3\lib\site-packages\spyder\plugins\ipythonconsole\comms\kernelcomm.py", line 130, in _get_call_return_value
with self.comm_channel_manager(comm_id, queue_message=not interrupt):
File "C:\Users\Giovanni\Anaconda3\lib\contextlib.py", line 112, in __enter__
return next(self.gen)
File "C:\Users\Giovanni\Anaconda3\lib\site-packages\spyder\plugins\ipythonconsole\comms\kernelcomm.py", line 87, in comm_channel_manager
timeout)
File "C:\Users\Giovanni\Anaconda3\lib\site-packages\spyder\plugins\ipythonconsole\comms\kernelcomm.py", line 168, in _wait
raise TimeoutError(timeout_msg)
TimeoutError: Timeout while waiting for comm port.

# Fixed code
def create_kernel_manager_and_kernel_client(
    self,
    connection_file,
    stderr_handle,
    is_cython=False,
    is_pylab=False,
    is_sympy=False,
):
    """Create kernel manager and client."""
    # Kernel spec
    kernel_spec = self.create_kernel_spec(
        is_cython=is_cython, is_pylab=is_pylab, is_sympy=is_sympy
    )

    # Kernel manager
    try:
        kernel_manager = SpyderKernelManager(
            connection_file=connection_file,
            config=None,
            autorestart=True,
        )
    except Exception:
        error_msg = _("The error is:<br><br><tt>{}</tt>").format(traceback.format_exc())
        return (error_msg, None)
    kernel_manager._kernel_spec = kernel_spec

    kwargs = {}
    if os.name == "nt":
        # avoid closing fds on win+Python 3.7
        # which prevents interrupts
        # jupyter_client > 5.2.3 will do this by default
        kwargs["close_fds"] = False
    # Catch any error generated when trying to start the kernel.
    # See spyder-ide/spyder#7302.
    try:
        kernel_manager.start_kernel(stderr=stderr_handle, **kwargs)
    except Exception:
        error_msg = _("The error is:<br><br><tt>{}</tt>").format(traceback.format_exc())
        return (error_msg, None)

    # Kernel client
    kernel_client = kernel_manager.client()

    # Increase time to detect if a kernel is alive.
    # See spyder-ide/spyder#3444.
    kernel_client.hb_channel.time_to_dead = 45.0

    return kernel_manager, kernel_client