Stop the login loop after network error and add error message

tryton/common/common.py

@@ -593,6 +593,10 @@ def process_exception(exception, parent, obj='', method='', *args):
             if password is None:
                 raise Exception('NotLogged')
             res = rpc.login(rpc._USERNAME, password, host, port, rpc._DATABASE)
+            if res == -1:
+                message(_('Connection error!\n' \
+                        'Unable to connect to the server!'), parent)
+                return False
             if res < 0:
                 continue
             if obj and method:

tryton/gui/window/tree.py

@@ -278,6 +278,10 @@ class Tree(SignalEvent):
                     return True
                 res = rpc.login(rpc._USERNAME, password, host, port,
                         rpc._DATABASE)
+                if res == -1:
+                    common.message(_('Connection error!\n' \
+                            'Unable to connect to the server!'), self.window)
+                    return True
                 if res < 0:
                     continue
                 return False