diff --git a/examples/protocols/https_mbedtls/main/https_mbedtls_example_main.c b/examples/protocols/https_mbedtls/main/https_mbedtls_example_main.c
index b145a25d..50398a7d 100644
--- a/examples/protocols/https_mbedtls/main/https_mbedtls_example_main.c
+++ b/examples/protocols/https_mbedtls/main/https_mbedtls_example_main.c
@@ -19,6 +19,8 @@
 #include <sys/socket.h>
 #include <netdb.h>
 
+#include <lwip/apps/sntp.h>
+
 #include "mbedtls/platform.h"
 #include "mbedtls/net_sockets.h"
 #include "mbedtls/ssl.h"
diff --git a/examples/protocols/https_wolfssl/main/https_wolfssl_example_main.c b/examples/protocols/https_wolfssl/main/https_wolfssl_example_main.c
index 51cd0d2e..96f7d74d 100755
--- a/examples/protocols/https_wolfssl/main/https_wolfssl_example_main.c
+++ b/examples/protocols/https_wolfssl/main/https_wolfssl_example_main.c
@@ -125,7 +125,7 @@ static void wolfssl_client(void* pv)
         memset(&sock_addr, 0, sizeof(sock_addr));
         sock_addr.sin_family = AF_INET;
         sock_addr.sin_port = htons(WEB_PORT);
-        memcpy(&sock_addr.sin_addr.s_addr, entry->h_addr_list[0], entry->h_length);
+        sock_addr.sin_addr.s_addr = ((struct in_addr*)(entry->h_addr))->s_addr;
 
         printf("Connecting to %s:%d...\n", WEB_SERVER, WEB_PORT);
         ret = connect(socket, (struct sockaddr*)&sock_addr, sizeof(sock_addr));
diff --git a/examples/protocols/openssl_client/main/openssl_demo.c b/examples/protocols/openssl_client/main/openssl_demo.c
index cc100e82..6efef8f9 100644
--- a/examples/protocols/openssl_client/main/openssl_demo.c
+++ b/examples/protocols/openssl_client/main/openssl_demo.c
@@ -15,6 +15,7 @@
 #include "c_types.h"
 #include "esp_misc.h"
 #include "lwip/sockets.h"
+#include "lwip/api.h"
 #include "ssl_client_crt.h"
 
 #define OPENSSL_DEMO_THREAD_NAME "ssl_demo"
@@ -71,7 +72,7 @@ LOCAL void openssl_demo_thread(void* p)
         ret = netconn_gethostbyname(OPENSSL_DEMO_TARGET_NAME, &target_ip);
     } while (ret);
 
-    printf("get target IP is "IPSTR"\n", IP2STR(&target_ip));
+    printf("get target IP is "IPSTR"\n", IP2STR(&(target_ip.u_addr.ip4)));
 
     printf("create SSL context ......");
     ctx = SSL_CTX_new(TLSv1_1_client_method());
@@ -144,11 +145,11 @@ LOCAL void openssl_demo_thread(void* p)
     printf("socket connect to remote ......");
     memset(&sock_addr, 0, sizeof(sock_addr));
     sock_addr.sin_family = AF_INET;
-    sock_addr.sin_addr.s_addr = target_ip.addr;
+    sock_addr.sin_addr.s_addr = target_ip.u_addr.ip4.addr;
     sock_addr.sin_port = htons(OPENSSL_DEMO_TARGET_TCP_PORT);
     ret = connect(socket, (struct sockaddr*)&sock_addr, sizeof(sock_addr));
     if (ret) {
-        printf("failed\n", OPENSSL_DEMO_TARGET_NAME);
+        printf("failed\n");
         goto failed5;
     }
     printf("OK\n");
diff --git a/examples/protocols/openssl_demo/main/openssl_demo.c b/examples/protocols/openssl_demo/main/openssl_demo.c
index b279af69..4a70810e 100644
--- a/examples/protocols/openssl_demo/main/openssl_demo.c
+++ b/examples/protocols/openssl_demo/main/openssl_demo.c
@@ -14,6 +14,7 @@
 #include "freertos/task.h"
 #include "c_types.h"
 #include "lwip/sockets.h"
+#include "lwip/api.h"
 
 #define OPENSSL_DEMO_THREAD_NAME "ssl_demo"
 #define OPENSSL_DEMO_THREAD_STACK_WORDS 2048
@@ -56,10 +57,10 @@ LOCAL void openssl_demo_thread(void *p)
     do {
         ret = netconn_gethostbyname(OPENSSL_DEMO_TARGET_NAME, &target_ip);
     } while(ret);
-    os_printf("get target IP is %d.%d.%d.%d\n", (unsigned char)((target_ip.addr & 0x000000ff) >> 0),
-                                                (unsigned char)((target_ip.addr & 0x0000ff00) >> 8),
-                                                (unsigned char)((target_ip.addr & 0x00ff0000) >> 16),
-                                                (unsigned char)((target_ip.addr & 0xff000000) >> 24));
+    os_printf("get target IP is %d.%d.%d.%d\n", (unsigned char)((target_ip.u_addr.ip4.addr & 0x000000ff) >> 0),
+                                                (unsigned char)((target_ip.u_addr.ip4.addr & 0x0000ff00) >> 8),
+                                                (unsigned char)((target_ip.u_addr.ip4.addr & 0x00ff0000) >> 16),
+                                                (unsigned char)((target_ip.u_addr.ip4.addr & 0xff000000) >> 24));
 
     os_printf("create SSL context ......");
     ctx = SSL_CTX_new(TLSv1_1_client_method());
@@ -101,11 +102,11 @@ LOCAL void openssl_demo_thread(void *p)
     os_printf("socket connect to remote ......");
     memset(&sock_addr, 0, sizeof(sock_addr));
     sock_addr.sin_family = AF_INET;
-    sock_addr.sin_addr.s_addr = target_ip.addr;
+    sock_addr.sin_addr.s_addr = target_ip.u_addr.ip4.addr;
     sock_addr.sin_port = htons(OPENSSL_DEMO_TARGET_TCP_PORT);
     ret = connect(socket, (struct sockaddr*)&sock_addr, sizeof(sock_addr));
     if (ret) {
-        os_printf("failed\n", OPENSSL_DEMO_TARGET_NAME);
+        os_printf("failed\n");
         goto failed5;
     }
     os_printf("OK\n");