diff --git a/plugins/mongodb/index.py b/plugins/mongodb/index.py
index e2fd17320..0f86cb884 100755
--- a/plugins/mongodb/index.py
+++ b/plugins/mongodb/index.py
@@ -214,8 +214,8 @@ def initDreplace():
 
     mg_key = getServerDir() + "/mongodb.key"
     if not os.path.exists(mg_key):
-        mw.execShell("openssl rand -base64 741 >> "+mg_key)
-        mw.execShell("chmod 600 "+mg_key)
+        mw.execShell("openssl rand -base64 756 >> "+mg_key)
+        mw.execShell("chmod 400 "+mg_key)
 
     file_tpl = getInitDTpl()
     service_path = os.path.dirname(os.getcwd())