diff --git a/apps/ops/serializers/job.py b/apps/ops/serializers/job.py
index 3bb91d463..6e95a1fb9 100644
--- a/apps/ops/serializers/job.py
+++ b/apps/ops/serializers/job.py
@@ -52,7 +52,7 @@ class JobSerializer(ResourceLabelsMixin, BulkOrgResourceModelSerializer, PeriodT
 
 
 class FileSerializer(serializers.Serializer):
-    files = serializers.FileField(allow_empty_file=True)
+    files = serializers.FileField(allow_empty_file=False, max_length=128)
 
     class Meta:
         ref_name = "JobFileSerializer"
diff --git a/apps/settings/utils/ldap.py b/apps/settings/utils/ldap.py
index 60babfa4e..23b7b3882 100644
--- a/apps/settings/utils/ldap.py
+++ b/apps/settings/utils/ldap.py
@@ -649,7 +649,7 @@ class LDAPTestUtil(object):
 
     def _test_before_login_check(self, username, password):
         from settings.ws import CACHE_KEY_LDAP_TEST_CONFIG_TASK_STATUS, TASK_STATUS_IS_OVER
-        if cache.get(CACHE_KEY_LDAP_TEST_CONFIG_TASK_STATUS) != TASK_STATUS_IS_OVER:
+        if not cache.get(CACHE_KEY_LDAP_TEST_CONFIG_TASK_STATUS):
             raise self.LDAPBeforeLoginCheckError(_('Please test the connection first'))
 
         backend = LDAPAuthorizationBackend()
diff --git a/apps/settings/ws.py b/apps/settings/ws.py
index 38bc54af0..0f8f344fe 100644
--- a/apps/settings/ws.py
+++ b/apps/settings/ws.py
@@ -161,8 +161,8 @@ class LdapWebsocket(AsyncJsonWebsocketConsumer):
         return cache.get(task_key) == TASK_STATUS_IS_OVER
 
     @staticmethod
-    def set_task_status_over(task_key):
-        cache.set(task_key, TASK_STATUS_IS_OVER, 120)
+    def set_task_status_over(task_key, ttl=120):
+        cache.set(task_key, TASK_STATUS_IS_OVER, ttl)
 
     @staticmethod
     def set_task_msg(task_key, ok, msg):
@@ -192,7 +192,7 @@ class LdapWebsocket(AsyncJsonWebsocketConsumer):
                 username = serializer.validated_data['username']
                 password = serializer.validated_data['password']
                 ok, msg = LDAPTestUtil().test_login(username, password)
-                self.set_task_status_over(CACHE_KEY_LDAP_TEST_LOGIN_TASK_STATUS)
+                self.set_task_status_over(CACHE_KEY_LDAP_TEST_LOGIN_TASK_STATUS, 3)
             self.set_task_msg(CACHE_KEY_LDAP_TEST_LOGIN_MSG, ok, msg)
 
     def run_sync_user(self, data):