diff --git a/src/main/java/org/bdware/server/CMHttpServer.java b/src/main/java/org/bdware/server/CMHttpServer.java
index 7cc8389..939c2a2 100644
--- a/src/main/java/org/bdware/server/CMHttpServer.java
+++ b/src/main/java/org/bdware/server/CMHttpServer.java
@@ -162,7 +162,7 @@ public class CMHttpServer {
                         String[] paths = cmdConf.startContract.split(",");
                         for (String path : paths) {
                             File f = new File(path);
-                            if (!f.getName().endsWith(".ypk"))
+                            if (!f.getName().endsWith(".ypk") || !f.exists())
                                 continue;
                             Contract c = new Contract();
                             c.setScript(f.getAbsolutePath());
diff --git a/src/main/java/org/bdware/server/GlobalConf.java b/src/main/java/org/bdware/server/GlobalConf.java
index 3d2d51c..5646e01 100644
--- a/src/main/java/org/bdware/server/GlobalConf.java
+++ b/src/main/java/org/bdware/server/GlobalConf.java
@@ -45,6 +45,7 @@ public class GlobalConf {
     public String ipPort;
     public boolean isLAN = true;
     private String nodeCenterUrl; // 从ConfigDB读。
+    private String nodeCenterWSUrl;
 
     private static GlobalConf init() {
         java.util.logging.Logger.getLogger(org.bdware.bdledger.api.grpc.Client.class.getName())
@@ -157,6 +158,8 @@ public class GlobalConf {
             conf.isLAN = "true".equals(KeyValueDBUtil.instance.getValue(dbName, "isLAN"));
             conf.masterAddress = KeyValueDBUtil.instance.getValue(dbName, "masterAddress");
             conf.nodeCenterUrl = KeyValueDBUtil.instance.getValue(dbName, "nodeCenter");
+            conf.nodeCenterWSUrl = KeyValueDBUtil.instance.getValue(dbName, "nodeCenterWS");
+
             conf.peerID = KeyValueDBUtil.instance.getValue(dbName, "peerID");
             conf.keyPairStr = KeyValueDBUtil.instance.getValue(dbName, "keyPairStr");
             // logger.debug("keyPairStr" + conf.keyPairStr);
@@ -355,6 +358,19 @@ public class GlobalConf {
         }
     }
 
+    public static boolean resetNodeCenterWS(String val) {
+        try {
+            instance.nodeCenterWSUrl = val;
+            KeyValueDBUtil.instance.setValue(CMTables.ConfigDB.toString(), "nodeCenterWS", val);
+            return true;
+        } catch (Exception e) {
+            LOGGER.error(e.getMessage());
+            LOGGER.debug(ExceptionUtil.exceptionToString(e));
+            return false;
+        }
+    }
+
+
     public static boolean resetDeviceName(String val) {
         try {
             KeyValueDBUtil.instance.setValue(CMTables.ConfigDB.toString(), "nodeName", val);
@@ -460,6 +476,10 @@ public class GlobalConf {
         return instance.keyPair.getPublicKeyStr();
     }
 
+    public static String getNodeCenterWSUrl() {
+        return instance.nodeCenterWSUrl;
+    }
+
     public boolean resetLicenceInternal(String licence2) {
         licence2 = licence2.replaceAll(" ", "+");
         LOGGER.info("resetLicence:" + licence2);
diff --git a/src/main/java/org/bdware/server/action/ManagerActions.java b/src/main/java/org/bdware/server/action/ManagerActions.java
index d177976..7fd6e58 100644
--- a/src/main/java/org/bdware/server/action/ManagerActions.java
+++ b/src/main/java/org/bdware/server/action/ManagerActions.java
@@ -154,6 +154,7 @@ public class ManagerActions {
         data.put("clusterConnected", String.valueOf(NetworkManager.instance.isConnectedToNodeCenter()));
         data.put("nodePubKey", GlobalConf.instance.keyPair.getPublicKeyStr());
         data.put("masterAddress", GlobalConf.instance.masterAddress);
+        data.put("nodeCenterWS",GlobalConf.getNodeCenterWSUrl());
         ReplyUtil.replyWithStatus(resultCallback, "onLoadNodeConfig", true, data);
     }
 
@@ -163,6 +164,13 @@ public class ManagerActions {
         LOGGER.debug(JsonUtil.toJson(args));
         ReplyUtil.replyWithStatus(resultCallback, "onChangeNodeCenter", true, GlobalConf.resetNodeCenter(val));
     }
+    @Action(userPermission = 1 << 10)
+    public void changeNodeCenterWS(JsonObject args, ResultCallback resultCallback) {
+        String val = args.get("data").getAsString();
+        LOGGER.debug(JsonUtil.toJson(args));
+        ReplyUtil.replyWithStatus(resultCallback, "onChangeNodeCenter", true, GlobalConf.resetNodeCenterWS(val));
+    }
+
 
     @Action(userPermission = 1 << 10)
     public void changeBDledger(JsonObject args, ResultCallback resultCallback) {