diff --git a/data/ui/MainWindow.ui b/data/ui/MainWindow.ui
index d72729d..8df421d 100644
--- a/data/ui/MainWindow.ui
+++ b/data/ui/MainWindow.ui
@@ -120,12 +120,85 @@
       </object>
     </child>
     <child>
-      <object class="GtkStack" id="stack_perspectives">
+      <object class="GtkOverlay">
         <property name="visible">True</property>
         <property name="can_focus">False</property>
-        <property name="transition_type">crossfade</property>
         <child>
-          <placeholder/>
+          <object class="GtkStack" id="stack_perspectives">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="transition_type">crossfade</property>
+            <child>
+              <placeholder/>
+            </child>
+          </object>
+          <packing>
+            <property name="index">-1</property>
+          </packing>
+        </child>
+        <child type="overlay">
+          <object class="GtkRevealer" id="overlay_reauth">
+            <property name="visible">True</property>
+            <property name="can_focus">False</property>
+            <property name="halign">center</property>
+            <property name="valign">start</property>
+            <property name="transition_type">none</property>
+            <child>
+              <object class="GtkFrame">
+                <property name="visible">True</property>
+                <property name="can_focus">False</property>
+                <property name="label_xalign">0</property>
+                <child>
+                  <object class="GtkBox">
+                    <property name="visible">True</property>
+                    <property name="can_focus">False</property>
+                    <property name="halign">center</property>
+                    <property name="valign">start</property>
+                    <property name="margin_left">12</property>
+                    <property name="margin_right">4</property>
+                    <property name="margin_start">12</property>
+                    <property name="margin_end">4</property>
+                    <child>
+                      <object class="GtkLabel">
+                        <property name="visible">True</property>
+                        <property name="can_focus">False</property>
+                        <property name="margin_right">10</property>
+                        <property name="label" translatable="yes">Authorization error while connecting to the device </property>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">0</property>
+                      </packing>
+                    </child>
+                    <child>
+                      <object class="GtkButton" id="notification_reauth">
+                        <property name="label" translatable="yes">Register</property>
+                        <property name="visible">True</property>
+                        <property name="can_focus">True</property>
+                        <property name="receives_default">True</property>
+                        <property name="no_show_all">True</property>
+                        <property name="margin_right">6</property>
+                        <property name="margin_end">6</property>
+                        <signal name="clicked" handler="_on_reauth_clicked" swapped="no"/>
+                        <style>
+                          <class name="text-button"/>
+                        </style>
+                      </object>
+                      <packing>
+                        <property name="expand">False</property>
+                        <property name="fill">True</property>
+                        <property name="position">1</property>
+                      </packing>
+                    </child>
+                  </object>
+                </child>
+                <style>
+                  <class name="app-notification"/>
+                </style>
+              </object>
+            </child>
+          </object>
         </child>
       </object>
     </child>
diff --git a/tuhi/gui/tuhi.py b/tuhi/gui/tuhi.py
index 9641f34..6d871dd 100644
--- a/tuhi/gui/tuhi.py
+++ b/tuhi/gui/tuhi.py
@@ -156,7 +156,7 @@ class TuhiKeteDevice(_DBusObject):
         'registered':
             (GObject.SignalFlags.RUN_FIRST, None, (GObject.TYPE_PYOBJECT,)),
         'device-error':
-            (GObject.SignalFlags.RUN_FIRST, None, (GObject.TYPE_PYOBJECT, int)),
+            (GObject.SignalFlags.RUN_FIRST, None, (int,)),
     }
 
     def __init__(self, manager, objpath):
@@ -248,7 +248,7 @@ class TuhiKeteDevice(_DBusObject):
                 logger.error(f'{self}: wrong device, please re-register.')
             elif err < 0:
                 logger.error(f'{self}: an error occured: {os.strerror(-err)}')
-            self.emit('device-error', self, err)
+            self.emit('device-error', err)
             self.notify('listening')
         elif signal == 'SyncState':
             self._sync_state = parameters[0]
diff --git a/tuhi/gui/window.py b/tuhi/gui/window.py
index 1a755ca..22f8ac0 100644
--- a/tuhi/gui/window.py
+++ b/tuhi/gui/window.py
@@ -126,6 +126,7 @@ class MainWindow(Gtk.ApplicationWindow):
     spinner_sync = Gtk.Template.Child()
     image_battery = Gtk.Template.Child()
     image_missing_tablet = Gtk.Template.Child()
+    overlay_reauth = Gtk.Template.Child()
 
     def __init__(self, **kwargs):
         super().__init__(**kwargs)
@@ -147,12 +148,20 @@ class MainWindow(Gtk.ApplicationWindow):
         self._add_perspective(ep)
         self.stack_perspectives.set_visible_child_name(ep.name)
 
+        self._signals = []
+
         # the dbus bindings need more async...
         if not self._tuhi.online:
             self._tuhi.connect('notify::online', self._on_dbus_online)
         else:
             self._on_dbus_online()
 
+    def _register_device(self):
+        dialog = SetupDialog(self._tuhi)
+        dialog.set_transient_for(self)
+        dialog.connect('response', self._on_setup_dialog_closed)
+        dialog.show()
+
     def _on_dbus_online(self, *args, **kwargs):
         logger.debug('dbus is online')
 
@@ -162,10 +171,7 @@ class MainWindow(Gtk.ApplicationWindow):
         self.stack_perspectives.set_visible_child_name(dp.name)
 
         if not self._tuhi.devices:
-            dialog = SetupDialog(self._tuhi)
-            dialog.set_transient_for(self)
-            dialog.connect('response', self._on_setup_dialog_closed)
-            dialog.show()
+            self._register_device()
         else:
             device = self._tuhi.devices[0]
             self._init_device(device)
@@ -173,9 +179,14 @@ class MainWindow(Gtk.ApplicationWindow):
             self.headerbar.set_title(f'Tuhi - {dp.device.name}')
 
     def _init_device(self, device):
-        device.connect('notify::sync-state', self._on_sync_state)
-        device.connect('notify::battery-percent', self._on_battery_changed)
-        device.connect('notify::battery-state', self._on_battery_changed)
+        sig = device.connect('notify::sync-state', self._on_sync_state)
+        self._signals.append(sig)
+        sig = device.connect('notify::battery-percent', self._on_battery_changed)
+        self._signals.append(sig)
+        sig = device.connect('notify::battery-state', self._on_battery_changed)
+        self._signals.append(sig)
+        sig = device.connect('device-error', self._on_device_error)
+        self._signals.append(sig)
         self._on_battery_changed(device, None)
 
     def _on_battery_changed(self, device, pspec):
@@ -208,6 +219,7 @@ class MainWindow(Gtk.ApplicationWindow):
             self.spinner_sync.stop()
 
     def _on_setup_dialog_closed(self, dialog, response):
+        self.overlay_reauth.set_reveal_child(False)
         device = dialog.device
         dialog.destroy()
 
@@ -223,6 +235,16 @@ class MainWindow(Gtk.ApplicationWindow):
         self._init_device(device)
         self.stack_perspectives.set_visible_child_name(dp.name)
 
+    def _on_device_error(self, device, err):
+        import errno
+        logger.info(f'Device error: {err}')
+        if err == -errno.EACCES:
+            self.overlay_reauth.set_reveal_child(True)
+            # No point to keep getting notified, it won't be able to
+            # register.
+            for sig in self._signals:
+                device.disconnect(sig)
+
     def _add_perspective(self, perspective):
         self.stack_perspectives.add_named(perspective, perspective.name)
 
@@ -240,3 +262,7 @@ class MainWindow(Gtk.ApplicationWindow):
     def _on_zoom_changed(self, adjustment):
         dp = self._get_child('drawing_perspective')
         dp.zoom = int(adjustment.get_value())
+
+    @Gtk.Template.Callback('_on_reauth_clicked')
+    def _on_reauth_clicked(self, button):
+        self._register_device()