diff --git a/config/etc/default/restconf.yaml b/config/etc/default/restconf.yaml
index e2ce9dfe..43646441 100644
--- a/config/etc/default/restconf.yaml
+++ b/config/etc/default/restconf.yaml
@@ -93,7 +93,7 @@ omc:
   vendor: ""
   dn: 4600
   chk2ne: false
-  sn: 13750650
+  sn: "-"
   checksign: false
   rootDir: /usr/local/omc
   binDir: /usr/local/omc/bin
@@ -128,7 +128,7 @@ alarm:
     signName: XXX SMSC
     templateCode: 1000
   
-#User authorized information
+# User authorized information
 # crypt: mysql/md5/bcrypt
 # token: true/false to check accessToken
 # expires for session, unit: second