diff --git a/java/README_CN.md b/java/README_CN.md
old mode 100644
new mode 100755
index 70162e8778595456c3a006055c751dd051b2d93c..a656203a5a7fdd1ca3d8fc434d89dd537e6c6413
--- a/java/README_CN.md
+++ b/java/README_CN.md
@@ -98,7 +98,7 @@ java -cp paddle-serving-sdk-java-examples-0.0.1-jar-with-dependencies.jar Pipeli
 
 ### 注意事项
 
-1.在示例中，端口号都是9393，ip默认设置为了0.0.0.0表示本机，注意ip和port需要与Server端对应。
+1.在示例中，端口号都是9393，ip默认设置为了127.0.0.1表示本机，注意ip和port需要与Server端对应。
 
 2.目前Serving已推出Pipeline模式（原理详见[Pipeline Serving](../doc/PIPELINE_SERVING_CN.md)），面向Java的Pipeline Serving Client已发布。
 
diff --git a/java/examples/src/main/java/PaddleServingClientExample.java b/java/examples/src/main/java/PaddleServingClientExample.java
index 73fe94856ff90177f7fa34535f2a2733c92068e3..153cc4afdd172b524383a78b8d1340ecebf1cc44 100755
--- a/java/examples/src/main/java/PaddleServingClientExample.java
+++ b/java/examples/src/main/java/PaddleServingClientExample.java
@@ -25,7 +25,7 @@ public class PaddleServingClientExample {
         List<String> fetch = Arrays.asList("price");
         
         Client client = new Client();
-        client.setIP("0.0.0.0");
+        client.setIP("127.0.0.1");
         client.setPort("9393");
         client.loadClientConfig(model_config_path);
         String result = client.predict(feed_data, fetch, true, 0);
@@ -49,7 +49,7 @@ public class PaddleServingClientExample {
         
         Client client = new Client();
         //注意：跨docker，需要设置--net-host或直接访问另一个docker的ip
-        client.setIP("0.0.0.0");
+        client.setIP("127.0.0.1");
         client.setPort("9393");
         client.set_http_proto(false);
         client.loadClientConfig(model_config_path);
@@ -73,7 +73,7 @@ public class PaddleServingClientExample {
         List<String> fetch = Arrays.asList("price");
         
         Client client = new Client();
-        client.setIP("0.0.0.0");
+        client.setIP("127.0.0.1");
         client.setPort("9393");
         client.loadClientConfig(model_config_path);
         client.set_use_grpc_client(true);
@@ -97,7 +97,7 @@ public class PaddleServingClientExample {
         List<String> fetch = Arrays.asList("price");
         
         Client client = new Client();
-        client.setIP("0.0.0.0");
+        client.setIP("127.0.0.1");
         client.setPort("9393");
         client.loadClientConfig(model_config_path);
         client.use_key(keyFilePath);
@@ -125,7 +125,7 @@ public class PaddleServingClientExample {
         List<String> fetch = Arrays.asList("price");
         
         Client client = new Client();
-        client.setIP("0.0.0.0");
+        client.setIP("127.0.0.1");
         client.setPort("9393");
         client.loadClientConfig(model_config_path);
         client.set_request_compress(true);
@@ -176,7 +176,7 @@ public class PaddleServingClientExample {
             }};
         List<String> fetch = Arrays.asList("save_infer_model/scale_0.tmp_0");
         Client client = new Client();
-        client.setIP("0.0.0.0");
+        client.setIP("127.0.0.1");
         client.setPort("9393");
         client.loadClientConfig(model_config_path);
         String result = client.predict(feed_data, fetch, true, 0);
@@ -198,7 +198,7 @@ public class PaddleServingClientExample {
             }};
         List<String> fetch = Arrays.asList("pooled_output");
         Client client = new Client();
-        client.setIP("0.0.0.0");
+        client.setIP("127.0.0.1");
         client.setPort("9393");
         client.loadClientConfig(model_config_path);
         String result = client.predict(feed_data, fetch, true, 0);
@@ -268,7 +268,7 @@ public class PaddleServingClientExample {
             }};
         List<String> fetch = Arrays.asList("prob");
         Client client = new Client();
-        client.setIP("0.0.0.0");
+        client.setIP("127.0.0.1");
         client.setPort("9393");
         client.loadClientConfig(model_config_path);
         String result = client.predict(feed_data, fetch, true, 0);
diff --git a/java/src/main/java/io/paddle/serving/client/Client.java b/java/src/main/java/io/paddle/serving/client/Client.java
index 5c283635f3c3146b5c9e3d227f1ee6485e24d5c6..63e861ba6199c7a56129c4d3b0cb03a77d26f6b7 100755
--- a/java/src/main/java/io/paddle/serving/client/Client.java
+++ b/java/src/main/java/io/paddle/serving/client/Client.java
@@ -134,7 +134,7 @@ public class Client {
         feedTensorLen_ = null;
         feedNameToIndex_ = null;
         timeoutS_ = 200000;
-        ip = "0.0.0.0";
+        ip = "127.0.0.1";
         port = "9393";
         serverPort = "9393";
         serviceName = "/GeneralModelService/inference";
diff --git a/python/paddle_serving_client/httpclient.py b/python/paddle_serving_client/httpclient.py
index 9dc414316fbb93bc59867f44c663ba1f59c729a3..e6ea65a40fd8436a1db0be8fa0d94ba33e64285e 100755
--- a/python/paddle_serving_client/httpclient.py
+++ b/python/paddle_serving_client/httpclient.py
@@ -75,7 +75,7 @@ def data_bytes_number(datalist):
 # 或者直接调用grpc_client_predict()
 class HttpClient(object):
     def __init__(self,
-                 ip="0.0.0.0",
+                 ip="127.0.0.1",
                  port="9393",
                  service_name="/GeneralModelService/inference"):
         self.feed_names_ = []
diff --git a/python/paddle_serving_server/serve.py b/python/paddle_serving_server/serve.py
index abccf5e179ccd4946fdf51a5f74ff6e5ee685b4c..8531e83fc1bb3a330d276e0c0d72616a810eea72 100755
--- a/python/paddle_serving_server/serve.py
+++ b/python/paddle_serving_server/serve.py
@@ -37,7 +37,7 @@ import socket
 def port_is_available(port):
     with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
         sock.settimeout(2)
-        result = sock.connect_ex(('0.0.0.0', port))
+        result = sock.connect_ex(('127.0.0.1', port))
     if result != 0:
         return True
     else:
diff --git a/python/paddle_serving_server/server.py b/python/paddle_serving_server/server.py
old mode 100644
new mode 100755
index d1d3155112e44b0c71faa0bdd704dffa826aa077..078f3702d125d5829cf1336b1b69493d471170fd
--- a/python/paddle_serving_server/server.py
+++ b/python/paddle_serving_server/server.py
@@ -537,7 +537,7 @@ class Server(object):
     def port_is_available(self, port):
         with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
             sock.settimeout(2)
-            result = sock.connect_ex(('0.0.0.0', port))
+            result = sock.connect_ex(('127.0.0.1', port))
         if result != 0:
             return True
         else:
diff --git a/python/paddle_serving_server/web_service.py b/python/paddle_serving_server/web_service.py
old mode 100644
new mode 100755
index e6405fbf2f06a895241ed1bf4b813ade7b42ed7a..52e394b2c07fd85b0da7be591c0b9a77669e19b6
--- a/python/paddle_serving_server/web_service.py
+++ b/python/paddle_serving_server/web_service.py
@@ -33,7 +33,7 @@ from paddle_serving_server.serve import format_gpu_to_strlist
 def port_is_available(port):
     with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
         sock.settimeout(2)
-        result = sock.connect_ex(('0.0.0.0', port))
+        result = sock.connect_ex(('127.0.0.1', port))
     if result != 0:
         return True
     else:
diff --git a/python/pipeline/util.py b/python/pipeline/util.py
old mode 100644
new mode 100755
index d7847f179de7557b5446958536008adc3c981f95..8bc15446b81c24162bbe2e236f204ffd1d0c23d1
--- a/python/pipeline/util.py
+++ b/python/pipeline/util.py
@@ -39,7 +39,7 @@ class AvailablePortGenerator(object):
     def port_is_available(port):
         with closing(socket.socket(socket.AF_INET, socket.SOCK_STREAM)) as sock:
             sock.settimeout(2)
-            result = sock.connect_ex(('0.0.0.0', port))
+            result = sock.connect_ex(('127.0.0.1', port))
         if result != 0:
             return True
         else: