diff --git a/apps/audits/signals_handler.py b/apps/audits/signals_handler.py
index e25bd9be9..5543cca3b 100644
--- a/apps/audits/signals_handler.py
+++ b/apps/audits/signals_handler.py
@@ -127,7 +127,11 @@ def on_audits_log_create(sender, instance=None, **kwargs):
 def get_login_backend(request):
     backend = request.session.get(BACKEND_SESSION_KEY, '')
     backend = backend.rsplit('.', maxsplit=1)[-1]
-    return LOGIN_BACKEND.get(backend, '')
+    if backend in LOGIN_BACKEND:
+        return LOGIN_BACKEND[backend]
+    else:
+        logger.warn(f'LOGIN_BACKEND_NOT_FOUND: {backend}')
+        return ''
 
 
 def generate_data(username, request):
diff --git a/apps/authentication/signals_handlers.py b/apps/authentication/signals_handlers.py
index 4c49f5d55..8174f0db7 100644
--- a/apps/authentication/signals_handlers.py
+++ b/apps/authentication/signals_handlers.py
@@ -1,5 +1,6 @@
 from importlib import import_module
 
+from django.contrib.auth import BACKEND_SESSION_KEY
 from django.conf import settings
 from django.contrib.auth import user_logged_in
 from django.core.cache import cache
@@ -24,14 +25,17 @@ def on_user_auth_login_success(sender, user, request, **kwargs):
 
 @receiver(openid_user_login_success)
 def on_oidc_user_login_success(sender, request, user, **kwargs):
+    request.session[BACKEND_SESSION_KEY] = 'OIDCAuthCodeBackend'
     post_auth_success.send(sender, user=user, request=request)
 
 
 @receiver(openid_user_login_failed)
 def on_oidc_user_login_failed(sender, username, request, reason, **kwargs):
+    request.session[BACKEND_SESSION_KEY] = 'OIDCAuthCodeBackend'
     post_auth_failed.send(sender, username=username, request=request, reason=reason)
 
 
 @receiver(cas_user_authenticated)
 def on_cas_user_login_success(sender, request, user, **kwargs):
-    post_auth_success.send(sender, user=user, request=request)
\ No newline at end of file
+    request.session[BACKEND_SESSION_KEY] = 'CASBackend'
+    post_auth_success.send(sender, user=user, request=request)
diff --git a/apps/common/drf/renders/base.py b/apps/common/drf/renders/base.py
index deac735cc..57f035f26 100644
--- a/apps/common/drf/renders/base.py
+++ b/apps/common/drf/renders/base.py
@@ -27,11 +27,13 @@ class BaseFileRenderer(BaseRenderer):
     def set_response_disposition(self, response):
         serializer = self.serializer
         if response and hasattr(serializer, 'Meta') and hasattr(serializer.Meta, "model"):
-            model_name = serializer.Meta.model.__name__.lower()
-            now = datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
-            filename = "{}_{}.{}".format(model_name, now, self.format)
-            disposition = 'attachment; filename="{}"'.format(filename)
-            response['Content-Disposition'] = disposition
+            filename_prefix = serializer.Meta.model.__name__.lower()
+        else:
+            filename_prefix = 'download'
+        now = datetime.now().strftime("%Y-%m-%d_%H-%M-%S")
+        filename = "{}_{}.{}".format(filename_prefix, now, self.format)
+        disposition = 'attachment; filename="{}"'.format(filename)
+        response['Content-Disposition'] = disposition
 
     def get_rendered_fields(self):
         fields = self.serializer.fields
diff --git a/apps/locale/zh/LC_MESSAGES/django.mo b/apps/locale/zh/LC_MESSAGES/django.mo
index 614aa0eec..b4b073c4e 100644
Binary files a/apps/locale/zh/LC_MESSAGES/django.mo and b/apps/locale/zh/LC_MESSAGES/django.mo differ
diff --git a/apps/locale/zh/LC_MESSAGES/django.po b/apps/locale/zh/LC_MESSAGES/django.po
index 816fdf726..ab3e7cc2a 100644
--- a/apps/locale/zh/LC_MESSAGES/django.po
+++ b/apps/locale/zh/LC_MESSAGES/django.po
@@ -1015,7 +1015,7 @@ msgstr "没有匹配到资产，结束任务"
 #: users/templates/users/user_list.html:98
 #: users/templates/users/user_remote_app_permission.html:111
 msgid "Delete"
-msgstr "删除文件"
+msgstr "删除"
 
 #: audits/models.py:27
 msgid "Upload"
diff --git a/apps/terminal/api/command.py b/apps/terminal/api/command.py
index fdafb1baf..0d5cb1553 100644
--- a/apps/terminal/api/command.py
+++ b/apps/terminal/api/command.py
@@ -60,7 +60,7 @@ class CommandQueryMixin:
         queryset = multi_command_storage.filter(
             date_from=date_from, date_to=date_to,
             user=q.get("user"), asset=q.get("asset"), system_user=q.get("system_user"),
-            input=q.get("input"), session=q.get("session_id"),
+            input=q.get("input"), session=q.get("session_id", q.get('session')),
             risk_level=self.get_query_risk_level(), org_id=self.get_org_id(),
         )
         return queryset
diff --git a/apps/terminal/models/session.py b/apps/terminal/models/session.py
index 4e2a1b99a..b35a618bc 100644
--- a/apps/terminal/models/session.py
+++ b/apps/terminal/models/session.py
@@ -132,7 +132,7 @@ class Session(OrgModelMixin):
             return None, e
 
         if settings.SERVER_REPLAY_STORAGE:
-            from .tasks import upload_session_replay_to_external_storage
+            from ..tasks import upload_session_replay_to_external_storage
             upload_session_replay_to_external_storage.delay(str(self.id))
         return name, None
 
@@ -146,10 +146,8 @@ class Session(OrgModelMixin):
         return cls.objects.filter(is_finished=False)
 
     def is_active(self):
-        if self.protocol in ['ssh', 'telnet', 'rdp', 'mysql']:
-            key = self.ACTIVE_CACHE_KEY_PREFIX.format(self.id)
-            return bool(cache.get(key))
-        return True
+        key = self.ACTIVE_CACHE_KEY_PREFIX.format(self.id)
+        return bool(cache.get(key))
 
     @property
     def command_amount(self):
diff --git a/apps/terminal/serializers/components.py b/apps/terminal/serializers/components.py
index e557d8f4f..d6e6d7f56 100644
--- a/apps/terminal/serializers/components.py
+++ b/apps/terminal/serializers/components.py
@@ -6,17 +6,17 @@ from django.utils.translation import ugettext_lazy as _
 class ComponentsStateSerializer(serializers.Serializer):
     # system
     system_cpu_load_1 = serializers.FloatField(
-        required=False, default=0, label=_("System cpu load (1 minutes)")
+        required=False, label=_("System cpu load (1 minutes)")
     )
     system_memory_used_percent = serializers.FloatField(
-        required=False, default=0, label=_('System memory used percent')
+        required=False, label=_('System memory used percent')
     )
     system_disk_used_percent = serializers.FloatField(
-        required=False, default=0, label=_('System disk used percent')
+        required=False, label=_('System disk used percent')
     )
     # sessions
     session_active_count = serializers.IntegerField(
-        required=False, default=0, label=_("Session active count")
+        required=False, label=_("Session active count")
     )
 
     def save(self, **kwargs):
diff --git a/apps/terminal/utils.py b/apps/terminal/utils.py
index d85e21deb..b480503d5 100644
--- a/apps/terminal/utils.py
+++ b/apps/terminal/utils.py
@@ -116,7 +116,8 @@ class ComponentsMetricsUtil(object):
 
     def get_metrics(self, tp=None):
         components = self.get_components(tp)
-        total_count = normal_count = high_count = critical_count = session_active_total = 0
+        total_count = normal_count = high_count = critical_count = offline_count = \
+            session_active_total = 0
         for component in components:
             total_count += 1
             if component.is_alive:
@@ -129,12 +130,13 @@ class ComponentsMetricsUtil(object):
                     critical_count += 1
                 session_active_total += component.state.get('session_active_count', 0)
             else:
-                critical_count += 1
+                offline_count += 1
         return {
             'total': total_count,
             'normal': normal_count,
             'high': high_count,
             'critical': critical_count,
+            'offline': offline_count,
             'session_active': session_active_total
         }
 
@@ -147,7 +149,8 @@ class ComponentsPrometheusMetricsUtil(ComponentsMetricsUtil):
             'any': metrics['total'],
             'normal': metrics['normal'],
             'high': metrics['high'],
-            'critical': metrics['critical']
+            'critical': metrics['critical'],
+            'offline': metrics['offline']
         }
 
     def get_prometheus_metrics_text(self):
diff --git a/apps/users/api/relation.py b/apps/users/api/relation.py
index 218d52142..bbcb5932b 100644
--- a/apps/users/api/relation.py
+++ b/apps/users/api/relation.py
@@ -28,3 +28,12 @@ class UserUserGroupRelationViewSet(JMSBulkRelationModelViewSet):
             return False
         else:
             return True
+
+    def perform_create(self, serializer):
+        validated_data = []
+        for item in serializer.validated_data:
+            if item['user'].role == User.ROLE.AUDITOR:
+                continue
+            validated_data.append(item)
+        serializer._validated_data = validated_data
+        return super().perform_create(serializer)