diff -up nut-2.6.5/scripts/python/app/NUT-Monitor.unreachable nut-2.6.5/scripts/python/app/NUT-Monitor-py2gtk2.in

--- nut-2.6.5/scripts/python/app/NUT-Monitor.unreachable	2012-07-31 19:38:56.000000000 +0200

+++ nut-2.6.5/scripts/python/app/NUT-Monitor-py2gtk2.in	2013-01-07 18:04:26.532531441 +0100

@@ -674,6 +674,11 @@ class interface :

             self.gui_status_notification( _("Device '%s' not found on server") % self.__current_ups, "warning.png" )

             return

+        if not self.__ups_handler.CheckUPSAvailable( self.__current_ups ): 

+            self.gui_status_message( _("UPS '{0}' is not reachable").format( self.__current_ups ) )

+            self.gui_status_notification( _("UPS '{0}' is not reachable").format( self.__current_ups ), "warning.png" )

+            return

+

         self.__connected = True

         self.__widgets["ups_connect"].hide()

         self.__widgets["ups_disconnect"].show()

diff -up nut-2.6.5/scripts/python/app/NUT-Monitor.unreachable nut-2.6.5/scripts/python/app/NUT-Monitor-py3qt5.in

--- nut-2.6.5/scripts/python/app/NUT-Monitor.unreachable	2012-07-31 19:38:56.000000000 +0200

+++ nut-2.6.5/scripts/python/app/NUT-Monitor-py3qt5.in	2013-01-07 18:04:26.532531441 +0100

@@ -674,6 +674,11 @@ class interface :

             self.gui_status_notification( _("Device '%s' not found on server") % self.__current_ups, "warning.png" )

             return

+        if not self.__ups_handler.CheckUPSAvailable( self.__current_ups ):

+            self.gui_status_message( _("UPS '{0}' is not reachable").format( self.__current_ups ) )

+            self.gui_status_notification( _("UPS '{0}' is not reachable").format( self.__current_ups ), "warning.png" )

+            return

+

         self.__connected = True

         self.__widgets["ups_connect"].hide()

         self.__widgets["ups_disconnect"].show()

diff -up nut-2.6.5/scripts/python/module/PyNUT.py.unreachable nut-2.6.5/scripts/python/module/PyNUT.py.in

--- nut-2.6.5/scripts/python/module/PyNUT.py.unreachable	2012-07-31 19:38:56.000000000 +0200

+++ nut-2.6.5/scripts/python/module/PyNUT.py.in	2013-01-07 17:41:26.548440712 +0100

@@ -158,6 +158,20 @@ available vars.

         return( ups_vars )

+    def CheckUPSAvailable( self, ups="") :

+        """ Check whether UPS is reachable

+

+Just tries to contact UPS with safe command.

+The result is True (rechable) or False (unreachable)

+        """

+        self.__srv_handler.write( "LIST CMD %s\n" % ups )

+        result = self.__srv_handler.read_until( "\n" )

+        if result != "BEGIN LIST CMD %s\n" % ups :

+            return False

+

+        self.__srv_handler.read_until( "END LIST CMD %s\n" % ups )

+        return True

+

     def GetUPSCommands( self, ups="" ) :

         """ Get all available commands for the specified UPS