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 sudo ./cp_client -m k -u mkuerfke vpn.leipziger-messe.de                                        1 ↵
GW url(host) is: vpn.leipziger-messe.de
Checking SSL mode.
SSL mode is: strict.
Traceback (most recent call last):
  File "/home/hisham/.local/bin/./cp_client", line 8, in <module>
    sys.exit(main())
             ~~~~^^
  File "/home/hisham/.local/share/pipx/venvs/cpyvpn/lib/python3.13/site-packages/cpyvpn/client.py", line 480, in main
    vpn_main(options, vna_args)
    ~~~~~~~~^^^^^^^^^^^^^^^^^^^
  File "/home/hisham/.local/share/pipx/venvs/cpyvpn/lib/python3.13/site-packages/cpyvpn/client.py", line 251, in vpn_main
    options.vna_obj = es.enter_context(vna.init_vna(vna_args))
                                       ~~~~~~~~~~~~^^^^^^^^^^
  File "/home/hisham/.local/share/pipx/venvs/cpyvpn/lib/python3.13/site-packages/cpyvpn/vna.py", line 513, in init_vna
    raise RuntimeError("VNA initialisation failed! Check your -s/-S option, make sure Network Manager can handle TUN interfaces, use --null_vna hidden option.")
RuntimeError: VNA initialisation failed! Check your -s/-S option, make sure Network Manager can handle TUN interfaces, use --null_vna hidden option.