as reported by @pmarek on irc:

ConfigureAppletWindow.apply_changes()
Traceback (most recent call last):
 File "winswitch/ui/config_common.py", line 621, in apply_changes
  self.do_apply_changes()
 File "winswitch/ui/config_applet.py", line 1014, in do_apply_changes
  self.applet.settings_modified()
 File "winswitch/client/applet.py", line 757, in settings_modified
  self.init_client_utils()
 File "winswitch/client/client_base.py", line 356, in init_client_utils
  self.client_utils[session_type] = constructor()
 File "winswitch/client/client_base.py", line 338, in rdp_common
 return     RDPClientUtil(self.update_session_status, self.notify)
 File "winswitch/virt/rdp_client_util.py", line 18, in __init__
  RDPClientBase.__init__(self, update_session_status, notify_callback)
 File "winswitch/virt/rdp_client_base.py", line 38, in __init__
  ClientUtilBase.__init__(self, WINDOWS_TYPE, update_session_status, notify_callback)
 File "winswitch/virt/client_util_base.py", line 48, in __init__
  self.options_defaults = self.load_options_defaults()
 File "winswitch/virt/client_util_base.py", line 58, in load_options_defaults
  props = self.get_options_defaults()
 File "winswitch/virt/rdp_client_base.py", line 373, in get_option
  props = self.get_options_defaults()
 File "winswitch/virt/rdp_client_base.py", line 373, in get_options_defaults
  d[KEYMAP] = self.get_default_keymap()
 File "winswitch/virt/rdp_client_base.py", line 85, in get_default_keymap
  if k in self.keymaps.keys():
AttributeError: RDPClientUtil instance has no attribute 'keymaps'

I cannot explain why keymaps is not defined... The RDPClientBase constructor looks like this:

		ClientUtilBase.__init__(self, WINDOWS_TYPE, update_session_status, notify_callback)
		self.ignore_process_returncodes.append(2)		#closing the window causes this returncode!
		if ENABLE_KEYMAP_OPTION:
			self.keymaps = self.find_all_keymaps()
			self.default_keymap = self.get_default_keymap()

(ENABLE_KEYMAP_OPTION is hardcoded to True) And this constructor is called by the RDPClientUtil constructor..

While winswitch client is trying to connect to some other winswitch server through m_DNS. It is failing to connect through ssh. Through Direct connection it succeeds. But, opening a remote application, doesn't shows on the requesting host.

I am running latest winswitch version 0.12.21, with xpra version 0.16.1. My both host system where connection is expected, is Ubuntu 15.04. I have also seen this issue in Ubuntu 15.10.

I tried to run the winswitch_applet in debug mode. Attaching a screenshot for the same.

xpra-0.8.0-9.fc18.x86_64
winswitch-0.12.18-2.x86_64

applet.py:751:do_stop_server:AttributeError: ServerLineConnection instance has no attribute 'stop_server'

Traceback (most recent call last):
  File "/usr/lib/python2.7/site-packages/winswitch/ui/dialog_util.py", line 119, in <lambda>
    dialog.connect('response', lambda dialog, response_id: ask_response_callback(dialog, response_id))
  File "/usr/lib/python2.7/site-packages/winswitch/ui/dialog_util.py", line 105, in ask_response_callback
    ok_callback()
  File "/usr/lib/python2.7/site-packages/winswitch/client/applet.py", line 746, in <lambda>
    None, lambda: self.do_stop_server(server))
  File "/usr/lib/python2.7/site-packages/winswitch/client/applet.py", line 751, in do_stop_server
    client.stop_server("User request")
AttributeError: ServerLineConnection instance has no attribute 'stop_server'

Local variables in innermost frame:
self: <winswitch.client.applet.WinSwitchApplet instance at 0x7ff10efdda70>
client: <winswitch.client.server_line_connection.ServerLineConnection instance at 0x25e1950>
server: <winswitch.objects.server_config.ServerConfig instance at 0x25eb638>