diff --git a/spug_api/apps/schedule/executors.py b/spug_api/apps/schedule/executors.py
index 6e4efaa..82affc0 100644
--- a/spug_api/apps/schedule/executors.py
+++ b/spug_api/apps/schedule/executors.py
@@ -3,11 +3,12 @@
 # Released under the MIT License.
 from queue import Queue
 from threading import Thread
-from libs.ssh import SSH
+from libs.ssh import SSH, AuthenticationException
 from apps.host.models import Host
 from apps.setting.utils import AppSetting
 from django.db import close_old_connections
 import subprocess
+import socket
 import time
 
 
@@ -26,8 +27,13 @@ def host_executor(q, host, pkey, command):
     try:
         cli = SSH(host.hostname, host.port, host.username, pkey=pkey)
         exit_code, out = cli.exec_command(command)
+        out = out.decode() if out else None
+    except AuthenticationException:
+        out = 'ssh authentication fail'
+    except socket.error as e:
+        out = f'network error {e}'
     finally:
-        q.put((host.id, exit_code, round(time.time() - now, 3), out.decode() if out else None))
+        q.put((host.id, exit_code, round(time.time() - now, 3), out))
 
 
 def dispatch(command, targets):