File "/usr/local/lib/python3.5/dist-packages/electrum/util.py", line 792, in run_with_except_hook
    run_original(*args2, **kwargs2)
  File "/usr/local/lib/python3.5/dist-packages/electrum/interface.py", line 233, in run
    socket = self.get_socket()
  File "/usr/local/lib/python3.5/dist-packages/electrum/interface.py", line 176, in get_socket
    f.write(cert)