diff --git a/devices.py b/devices.py
index e9d4cdb..66f22fa 100644
--- a/devices.py
+++ b/devices.py
@@ -297,11 +297,13 @@ class FrappyNode(SecNodeDevice, Moveable):
             code, text = status.DISABLED, 'disabled'
         SecNodeDevice._set_status(self, code, text)
 
-    def restart(self, cfg=None, restart=True):
+    def restart(self, cfg=None, forced=True):
         """restart frappy server
 
         :param cfg: config for frappy server, if not given, restart with the same config
-        :param restart: when false, do not restart when already running with same cfg
+        :param forced: True: restart anyway, force using cfg
+           False: try to get cfg (1) from sea, (2) from running frappy server, (3) from given cfg
+                  when cfg has not changed, do not restart
         """
         if cfg is None:
             cfg = self._cfgvalue
@@ -310,10 +312,18 @@ class FrappyNode(SecNodeDevice, Moveable):
         cfginfo = {}
         self._service_manager.get_procs(cfginfo=cfginfo)
         running_cfg = cfginfo.get((ins, self.service), '')
-        if cfg == running_cfg:
-            if not restart:
-               return
-        else:
+        if not forced:
+            sea_cfg = self._service_manager.cfg_from_sea(ins).get(self.service)
+            if sea_cfg == '?':
+                self.log.warning('undefined sea device')
+                cfg = ''  # stop server
+            elif sea_cfg:
+                cfg = sea_cfg
+            elif running_cfg:
+                return
+            if cfg == running_cfg:
+                return
+        if cfg != running_cfg:
             self.disable()
         if running_cfg:
             self._disconnect()