diff --git a/clients/client-linux.py b/clients/client-linux.py
index ce15b5a..c3ef97f 100755
--- a/clients/client-linux.py
+++ b/clients/client-linux.py
@@ -14,7 +14,8 @@ USER = "s01"
 PORT = 35601
 PASSWORD = "USER_DEFAULT_PASSWORD"
 INTERVAL = 1
-PORBEPORT = 80
+PROBEPORT = 80
+PROBE_PROTOCOL_PREFER = "ipv4"  # ipv4, ipv6
 PING_PACKET_HISTORY_LEN = 100
 CU = "cu.tz.cloudcpp.com"
 CT = "ct.tz.cloudcpp.com"
@@ -121,7 +122,7 @@ def ip_status():
     ip_check = 0
     for i in [CU, CT, CM]:
         try:
-            socket.create_connection((i, PORBEPORT), timeout=1).close()
+            socket.create_connection((i, PROBEPORT), timeout=1).close()
         except:
             ip_check += 1
     if ip_check >= 2:
@@ -163,13 +164,23 @@ def _ping_thread(host, mark, port):
     lostPacket = 0
     packet_queue = Queue(maxsize=PING_PACKET_HISTORY_LEN)
 
+    IP = host
+    if host.count(':') < 1:     # if not plain ipv6 address, means ipv4 address or hostname
+        try:
+            if PROBE_PROTOCOL_PREFER == 'ipv4':
+                IP = socket.getaddrinfo(host, None, socket.AF_INET)[0][4][0]
+            else:
+                IP = socket.getaddrinfo(host, None, socket.AF_INET6)[0][4][0]
+        except Exception:
+                pass
+
     while True:
         if packet_queue.full():
             if packet_queue.get() == 0:
                 lostPacket -= 1
         try:
             b = timeit.default_timer()
-            socket.create_connection((host, port), timeout=1).close()
+            socket.create_connection((IP, port), timeout=1).close()
             pingTime[mark] = int((timeit.default_timer()-b)*1000)
             packet_queue.put(1)
         except:
@@ -212,7 +223,7 @@ def get_realtime_date():
         kwargs={
             'host': CU,
             'mark': '10010',
-            'port': PORBEPORT
+            'port': PROBEPORT
         }
     )
     t2 = threading.Thread(
@@ -220,7 +231,7 @@ def get_realtime_date():
         kwargs={
             'host': CT,
             'mark': '189',
-            'port': PORBEPORT
+            'port': PROBEPORT
         }
     )
     t3 = threading.Thread(
@@ -228,7 +239,7 @@ def get_realtime_date():
         kwargs={
             'host': CM,
             'mark': '10086',
-            'port': PORBEPORT
+            'port': PROBEPORT
         }
     )
     t4 = threading.Thread(
diff --git a/clients/client-psutil.py b/clients/client-psutil.py
index 278f5f8..307f3dd 100755
--- a/clients/client-psutil.py
+++ b/clients/client-psutil.py
@@ -15,7 +15,8 @@ USER = "s01"
 PORT = 35601
 PASSWORD = "USER_DEFAULT_PASSWORD"
 INTERVAL = 1
-PORBEPORT = 80
+PROBEPORT = 80
+PROBE_PROTOCOL_PREFER = "ipv4"  # ipv4, ipv6
 PING_PACKET_HISTORY_LEN = 100
 CU = "cu.tz.cloudcpp.com"
 CT = "ct.tz.cloudcpp.com"
@@ -106,7 +107,7 @@ def ip_status():
     ip_check = 0
     for i in [CU, CT, CM]:
         try:
-            socket.create_connection((i, PORBEPORT), timeout=1).close()
+            socket.create_connection((i, PROBEPORT), timeout=1).close()
         except:
             ip_check += 1
     if ip_check >= 2:
@@ -148,13 +149,23 @@ def _ping_thread(host, mark, port):
     lostPacket = 0
     packet_queue = Queue(maxsize=PING_PACKET_HISTORY_LEN)
 
+    IP = host
+    if host.count(':') < 1:     # if not plain ipv6 address, means ipv4 address or hostname
+        try:
+            if PROBE_PROTOCOL_PREFER == 'ipv4':
+                IP = socket.getaddrinfo(host, None, socket.AF_INET)[0][4][0]
+            else:
+                IP = socket.getaddrinfo(host, None, socket.AF_INET6)[0][4][0]
+        except Exception:
+                pass
+
     while True:
         if packet_queue.full():
             if packet_queue.get() == 0:
                 lostPacket -= 1
         try:
             b = timeit.default_timer()
-            socket.create_connection((host, port), timeout=1).close()
+            socket.create_connection((IP, port), timeout=1).close()
             pingTime[mark] = int((timeit.default_timer() - b) * 1000)
             packet_queue.put(1)
         except:
@@ -193,7 +204,7 @@ def get_realtime_date():
         kwargs={
             'host': CU,
             'mark': '10010',
-            'port': PORBEPORT
+            'port': PROBEPORT
         }
     )
     t2 = threading.Thread(
@@ -201,7 +212,7 @@ def get_realtime_date():
         kwargs={
             'host': CT,
             'mark': '189',
-            'port': PORBEPORT
+            'port': PROBEPORT
         }
     )
     t3 = threading.Thread(
@@ -209,7 +220,7 @@ def get_realtime_date():
         kwargs={
             'host': CM,
             'mark': '10086',
-            'port': PORBEPORT
+            'port': PROBEPORT
         }
     )
     t4 = threading.Thread(