diff --git a/src/api.py b/src/api.py
index da40482..1ab4493 100644
--- a/src/api.py
+++ b/src/api.py
@@ -66,6 +66,9 @@ class addConfiguration:
         for i in configs:
             if i['port'] == port:
                 return {"status": False, "reason": f"{port} used by {i['conf']}."}
+        checkSystem = subprocess.run(f'ss -tulpn | grep :{port} > /dev/null', shell=True)
+        if checkSystem.returncode != 1:
+            return {"status": False, "reason": f"Port {port} used by other process in your system."}
         return good
 
     def NameCheck(self, data, configs):
diff --git a/src/dashboard.py b/src/dashboard.py
index b640f1d..c9c9d4a 100644
--- a/src/dashboard.py
+++ b/src/dashboard.py
@@ -607,19 +607,32 @@ def f_available_ips(config_name):
     """
     config_interface = read_conf_file_interface(config_name)
     if "Address" in config_interface:
+        available = []
         existed = []
         conf_address = config_interface['Address']
         address = conf_address.split(',')
         for i in address:
             add, sub = i.split("/")
-            existed.append(ipaddress.ip_address(add))
+            existed.append(ipaddress.ip_address(add.replace(" ", "")))
         peers = g.cur.execute("SELECT allowed_ip FROM " + config_name).fetchall()
         for i in peers:
             add = i[0].split(",")
             for k in add:
                 a, s = k.split("/")
                 existed.append(ipaddress.ip_address(a.strip()))
-        available = list(ipaddress.ip_network(address[0], False).hosts())
+        count = 0
+        for i in address:
+            tmpIP = ipaddress.ip_network(i.replace(" ", ""), False)
+            if tmpIP.version == 6:
+                for i in tmpIP.hosts():
+                    if i not in existed:
+                        available.append(i)
+                        count += 1
+                    if count > 100:
+                        break
+            else:
+                available = available + list(tmpIP.hosts())
+
         for i in existed:
             try:
                 available.remove(i)
diff --git a/src/templates/index.html b/src/templates/index.html
index 3ccb63f..783c996 100644
--- a/src/templates/index.html
+++ b/src/templates/index.html
@@ -9,7 +9,7 @@
 	{% include "navbar.html" %}
 	<div class="container-fluid">
         {% include "sidebar.html" %}
-		<main role="main" class="col-md-9 ml-sm-auto col-lg-10 px-md-4 mb-4">
+		<main role="main" class="col-md-9 ml-sm-auto col-lg-10 px-md-4 mb-4" style="margin-bottom: 10rem !important;">
             <div style="display: flex; flex-direction: row; align-items: center;">
                 <h1 class="pb-4 mt-4">Home</h1>
             </div>